function Browser() {
	
	  var ua, s, i;
	
	  this.isIE    = false;  // Internet Explorer
	  this.isNS    = false;  // Netscape
	  this.version = null;
	
	  ua = navigator.userAgent;
	
	  s = "MSIE";
	  if ((i = ua.indexOf(s)) >= 0) {
		this.isIE = true;
		this.version = parseFloat(ua.substr(i + s.length));
		return;
	  }
	
	  s = "Netscape6/";
	  if ((i = ua.indexOf(s)) >= 0) {
		this.isNS = true;
		this.version = parseFloat(ua.substr(i + s.length));
		return;
	  }
	
	  // Treat any other "Gecko" browser as NS 6.1.
	
	  s = "Gecko";
	  if ((i = ua.indexOf(s)) >= 0) {
		this.isNS = true;
		this.version = 6.1;
		return;
	  }
	}
	
	var browser = new Browser();
	
	//=============================================================================
	// Window Object
	//=============================================================================
	
	function Window(el) {
	
	  var i, mapList, mapName;
	
	  // Get window components.
	
	  this.frame           = el;
	  this.titleBar        = winFindByClassName(el, "titleBar");
	  this.titleBarText    = winFindByClassName(el, "titleBarText");
	  this.titleBarButtons = winFindByClassName(el, "titleBarButtons");
	  this.clientArea      = winFindByClassName(el, "clientArea");
	
	  // Find matching button image map.
	/*
	  mapName = this.titleBarButtons.useMap.substr(1);
	  mapList = document.getElementsByTagName("MAP");
	  for (i = 0; i < mapList.length; i++)
		if (mapList[i].name == mapName)
		  this.titleBarMap = mapList[i];
	*/
	  // Save colors.
	
	  this.activeFrameBackgroundColor  = this.frame.style.backgroundColor;
	  this.activeFrameBorderColor      = this.frame.style.borderColor;
	  this.activeTitleBarColor         = this.titleBar.style.backgroundColor;
	  this.activeTitleTextColor        = this.titleBar.style.color;
	  this.activeClientAreaBorderColor = this.clientArea.style.borderColor;
	  if (browser.isIE)
		this.activeClientAreaScrollbarColor = this.clientArea.style.scrollbarBaseColor;
	
	  // Save images.
	
	  this.activeButtonsImage   = this.titleBarButtons.src;
	  this.inactiveButtonsImage = this.titleBarButtons.longDesc;
	
	  // Set flags.
	
	  this.isOpen      = false;
	  this.isMinimized = false;
	
	  // Set methods.
	
	  this.open       = winOpen;
	  this.close      = winClose;
	  this.minimize   = winMinimize;
	  this.restore    = winRestore;
	  this.makeActive = winMakeActive;
	
	  // Set up event handling.
	
	  this.frame.parentWindow = this;
	  this.frame.onmousemove  = winResizeCursorSet;
	  this.frame.onmouseout   = winResizeCursorRestore;
	  this.frame.onmousedown  = winResizeDragStart;
	
	  this.titleBar.parentWindow = this;
	  this.titleBar.onmousedown  = winMoveDragStart;
	
	  this.clientArea.parentWindow = this;
	  this.clientArea.onclick      = winClientAreaClick;
	/*
	  for (i = 0; i < this.titleBarMap.childNodes.length; i++)
		if (this.titleBarMap.childNodes[i].tagName == "AREA")
		  this.titleBarMap.childNodes[i].parentWindow = this;
	*/
	  // Calculate the minimum width and height values for resizing
	  // and fix any initial display problems.
	
	  var initLt, initWd, w, dw;
	
	  // Save the inital frame width and position, then reposition
	  // the window.
	
	  initLt = this.frame.style.left;
	  initWd = parseInt(this.frame.style.width);
	  this.frame.style.left = -this.titleBarText.offsetWidth + "px";
	
	  // For IE, start calculating the value to use when setting
	  // the client area width based on the frame width.
	
	  if (browser.isIE) {
		this.titleBarText.style.display = "none";
		w = this.clientArea.offsetWidth;
		this.widthDiff = this.frame.offsetWidth - w;
		this.clientArea.style.width = w + "px";
		dw = this.clientArea.offsetWidth - w;
		w -= dw;     
		this.widthDiff += dw;
		this.titleBarText.style.display = "";
	  }
	
	  // Find the difference between the frame's style and offset
	  // widths. For IE, adjust the client area/frame width
	  // difference accordingly.
	
	  w = this.frame.offsetWidth;
	  this.frame.style.width = w + "px";
	  dw = this.frame.offsetWidth - w;
	  w -= dw;     
	  this.frame.style.width = w + "px";
	  if (browser.isIE)
		this.widthDiff -= dw;
	
	  // Find the minimum width for resize.
	
	  this.isOpen = true;  // Flag as open so minimize call will work.
	  this.minimize();
	  // Get the minimum width.
	  if (browser.isNS && browser.version >= 1.2)
		// For later versions of Gecko.
		this.minimumWidth = this.frame.offsetWidth;
	  else
		// For all others.
		this.minimumWidth = this.frame.offsetWidth - dw;
	
	  // Find the frame width at which or below the title bar text will
	  // need to be clipped.
	
	  this.titleBarText.style.width = "";
	  this.clipTextMinimumWidth = this.frame.offsetWidth - dw;
	
	  // Set the minimum height.
	
	  this.minimumHeight = 1;
	
	  // Restore window. For IE, set client area width.
	
	  this.restore();
	  this.isOpen = false;  // Reset flag.
	  initWd = Math.max(initWd, this.minimumWidth);
	  this.frame.style.width = initWd + "px";
	  if (browser.isIE)
		this.clientArea.style.width = (initWd - this.widthDiff) + "px";
	
	  // Clip the title bar text if needed.
	
	  if (this.clipTextMinimumWidth >= this.minimumWidth)
		this.titleBarText.style.width = (winCtrl.minimizedTextWidth + initWd - this.minimumWidth) + "px";
	
	  // Restore the window to its original position.
	
	  this.frame.style.left = initLt;
	}
	
	//=============================================================================
	// Window Methods
	//=============================================================================
	
	function winOpen() {
	
	  if (this.isOpen)
		return;
	
	  // Restore the window and make it visible.
	
	  this.makeActive();
	  this.isOpen = true;
	  if (this.isMinimized)
		this.restore();
	  this.frame.style.visibility = "visible";
	}
	
	function winClose() {
	
	  // Hide the window.
	
	  this.frame.style.visibility = "hidden";
	  this.isOpen = false;
	}
	
	function winMinimize() {
	
	  if (!this.isOpen || this.isMinimized)
		return;
	
	  this.makeActive();
	
	  // Save current frame and title bar text widths.
	
	  this.restoreFrameWidth = this.frame.style.width;
	  this.restoreTextWidth = this.titleBarText.style.width;
	
	  // Disable client area display.
	
	  this.clientArea.style.display = "none";
	
	  // Minimize frame and title bar text widths.
	
	  if (this.minimumWidth)
		this.frame.style.width = this.minimumWidth + "px";
	  else
		this.frame.style.width = "";
	  this.titleBarText.style.width = winCtrl.minimizedTextWidth + "px";
	
	  this.isMinimized = true;
	}
	
	function winRestore() {
	
	  if (!this.isOpen || !this.isMinimized)
		return;
	
	  this.makeActive();
	
	  // Enable client area display.
	
	  this.clientArea.style.display = "";
	
	  // Restore frame and title bar text widths.
	
	  this.frame.style.width = this.restoreFrameWidth;
	  this.titleBarText.style.width = this.restoreTextWidth;
	
	  this.isMinimized = false;
	}
	
	function winMakeActive() {
	
	  if (winCtrl.active == this)
		return;
	
	  // Inactivate the currently active window.
	
	  if (winCtrl.active) {
		winCtrl.active.frame.style.backgroundColor    = winCtrl.inactiveFrameBackgroundColor;
		winCtrl.active.frame.style.borderColor        = winCtrl.inactiveFrameBorderColor;
		winCtrl.active.titleBar.style.backgroundColor = winCtrl.inactiveTitleBarColor;
		winCtrl.active.titleBar.style.color           = winCtrl.inactiveTitleTextColor;
		winCtrl.active.clientArea.style.borderColor   = winCtrl.inactiveClientAreaBorderColor;
		if (browser.isIE)
		  winCtrl.active.clientArea.style.scrollbarBaseColor = winCtrl.inactiveClientAreaScrollbarColor;
		if (browser.isNS && browser.version < 6.1)
		  winCtrl.active.clientArea.style.overflow = "hidden";
		if (winCtrl.active.inactiveButtonsImage)
		  winCtrl.active.titleBarButtons.src = winCtrl.active.inactiveButtonsImage;
	  }
	
	  // Activate this window.
	
	  this.frame.style.backgroundColor    = this.activeFrameBackgroundColor;
	  this.frame.style.borderColor        = this.activeFrameBorderColor;
	  this.titleBar.style.backgroundColor = this.activeTitleBarColor;
	  this.titleBar.style.color           = this.activeTitleTextColor;
	  this.clientArea.style.borderColor   = this.activeClientAreaBorderColor;
	  if (browser.isIE)
		this.clientArea.style.scrollbarBaseColor = this.activeClientAreaScrollbarColor;
	  if (browser.isNS && browser.version < 6.1)
		this.clientArea.style.overflow = "auto";
	  if (this.inactiveButtonsImage)
		this.titleBarButtons.src = this.activeButtonsImage;
	  this.frame.style.zIndex = ++winCtrl.maxzIndex;
	  winCtrl.active = this;
	}
	
	//=============================================================================
	// Event handlers.
	//=============================================================================
	
	function winClientAreaClick(event) {
	
	  // Make this window the active one.
	
	  this.parentWindow.makeActive();
	}
	
	//-----------------------------------------------------------------------------
	// Window dragging.
	//-----------------------------------------------------------------------------
	
	function winMoveDragStart(event) {
	
	  var target;
	  var x, y;
	
	  if (browser.isIE)
		target = window.event.srcElement.tagName;
	  if (browser.isNS)
		target = event.target.tagName;
	
	  if (target == "AREA")
		return;
	
	  this.parentWindow.makeActive();
	
	  // Get cursor offset from window frame.
	
	  if (browser.isIE) {
		x = window.event.x;
		y = window.event.y;
	  }
	  if (browser.isNS) {
		x = event.pageX;
		y = event.pageY;
	  }
	  winCtrl.xOffset = winCtrl.active.frame.offsetLeft - x;
	  winCtrl.yOffset = winCtrl.active.frame.offsetTop  - y;
	
	  // Set document to capture mousemove and mouseup events.
	
	  if (browser.isIE) {
		document.onmousemove = winMoveDragGo;
		document.onmouseup   = winMoveDragStop;
	  }
	  if (browser.isNS) {
		document.addEventListener("mousemove", winMoveDragGo,   true);
		document.addEventListener("mouseup",   winMoveDragStop, true);
		event.preventDefault();
	  }
	
	  winCtrl.inMoveDrag = true;
	}
	
	function winMoveDragGo(event) {
	
	  var x, y;
	
	  if (!winCtrl.inMoveDrag)
		return;
	
	  // Get cursor position.
	
	  if (browser.isIE) {
		x = window.event.x;
		y = window.event.y;
		window.event.cancelBubble = true;
		window.event.returnValue = false;
	  }
	  if (browser.isNS) {
		x = event.pageX;
		y = event.pageY;
		event.preventDefault();
	  }
	
	  // Move window frame based on offset from cursor.
	
	  winCtrl.active.frame.style.left = (x + winCtrl.xOffset) + "px";
	  winCtrl.active.frame.style.top  = (y + winCtrl.yOffset) + "px";
	}
	
	function winMoveDragStop(event) {
	
	  winCtrl.inMoveDrag = false;
	
	  // Remove mousemove and mouseup event captures on document.
	
	  if (browser.isIE) {
		document.onmousemove = null;
		document.onmouseup   = null;
	  }
	  if (browser.isNS) {
		document.removeEventListener("mousemove", winMoveDragGo,   true);
		document.removeEventListener("mouseup",   winMoveDragStop, true);
	  }
	}
	
	//-----------------------------------------------------------------------------
	// Window resizing.
	//-----------------------------------------------------------------------------
	
	function winResizeCursorSet(event) {
	
	  var target;
	  var xOff, yOff;
	
	  if (this.parentWindow.isMinimized || winCtrl.inResizeDrag)
		return;
	
	  // If not on window frame, restore cursor and exit.
	
	  if (browser.isIE)
		target = window.event.srcElement;
	  if (browser.isNS)
		target = event.target;
	  if (target != this.parentWindow.frame)
		return;
	
	  // Find resize direction.
	
	  if (browser.isIE) {
		xOff = window.event.offsetX;
		yOff = window.event.offsetY;
	  }
	  if (browser.isNS) {
		xOff = event.layerX;
		yOff = event.layerY;
	  }
	  winCtrl.resizeDirection = ""
	  if (yOff <= winCtrl.resizeCornerSize)
		winCtrl.resizeDirection += "n";
	  else if (yOff >= this.parentWindow.frame.offsetHeight - winCtrl.resizeCornerSize)
		winCtrl.resizeDirection += "s";
	  if (xOff <= winCtrl.resizeCornerSize)
		winCtrl.resizeDirection += "w";
	  else if (xOff >= this.parentWindow.frame.offsetWidth - winCtrl.resizeCornerSize)
		winCtrl.resizeDirection += "e";
	
	  // If not on window edge, restore cursor and exit.
	
	  if (winCtrl.resizeDirection == "") {
		this.onmouseout(event);
		return;
	  }
	
	  // Change cursor.
	
	  if (browser.isIE)
		document.body.style.cursor = winCtrl.resizeDirection + "-resize";
	  if (browser.isNS)
		this.parentWindow.frame.style.cursor = winCtrl.resizeDirection + "-resize";
	}
	
	function winResizeCursorRestore(event) {
	
	  if (winCtrl.inResizeDrag)
		return;
	
	  // Restore cursor.
	
	  if (browser.isIE)
		document.body.style.cursor = "";
	  if (browser.isNS)
		this.parentWindow.frame.style.cursor = "";
	}
	
	function winResizeDragStart(event) {
	
	  var target;
	
	  // Make sure the event is on the window frame.
	
	  if (browser.isIE)
		target = window.event.srcElement;
	  if (browser.isNS)
		target = event.target;
	  if (target != this.parentWindow.frame)
		return;
	
	  this.parentWindow.makeActive();
	
	  if (this.parentWindow.isMinimized)
		return;
	
	  // Save cursor position.
	
	  if (browser.isIE) {
		winCtrl.xPosition = window.event.x;
		winCtrl.yPosition = window.event.y;
	  }
	  if (browser.isNS) {
		winCtrl.xPosition = event.pageX;
		winCtrl.yPosition = event.pageY;
	  }
	
	  // Save window frame position and current window size.
	
	  winCtrl.oldLeft   = parseInt(this.parentWindow.frame.style.left,  10);
	  winCtrl.oldTop    = parseInt(this.parentWindow.frame.style.top,   10);
	  winCtrl.oldWidth  = parseInt(this.parentWindow.frame.style.width, 10);
	  winCtrl.oldHeight = parseInt(this.parentWindow.clientArea.style.height, 10);
	
	  // Set document to capture mousemove and mouseup events.
	
	  if (browser.isIE) {
		document.onmousemove = winResizeDragGo;
		document.onmouseup   = winResizeDragStop;
	  }
	  if (browser.isNS) {
		document.addEventListener("mousemove", winResizeDragGo,   true);
		document.addEventListener("mouseup"  , winResizeDragStop, true);
		event.preventDefault();
	  }
	
	  winCtrl.inResizeDrag = true;
	}
	
	function winResizeDragGo(event) {
	
	 var north, south, east, west;
	 var dx, dy;
	 var w, h;
	
	  if (!winCtrl.inResizeDrag)
		return;
	
	  // Set direction flags based on original resize direction.
	
	  north = false;
	  south = false;
	  east  = false;
	  west  = false;
	  if (winCtrl.resizeDirection.charAt(0) == "n")
		north = true;
	  if (winCtrl.resizeDirection.charAt(0) == "s")
		south = true;
	  if (winCtrl.resizeDirection.charAt(0) == "e" || winCtrl.resizeDirection.charAt(1) == "e")
		east = true;
	  if (winCtrl.resizeDirection.charAt(0) == "w" || winCtrl.resizeDirection.charAt(1) == "w")
		west = true;
	
	  // Find change in cursor position.
	
	  if (browser.isIE) {
		dx = window.event.x - winCtrl.xPosition;
		dy = window.event.y - winCtrl.yPosition;
	  }
	  if (browser.isNS) {
		dx = event.pageX - winCtrl.xPosition;
		dy = event.pageY - winCtrl.yPosition;
	  }
	
	  // If resizing north or west, reverse corresponding amount.
	
	  if (west)
		dx = -dx;
	  if (north)
		dy = -dy;
	
	  // Check new size.
	
	  w = winCtrl.oldWidth  + dx;
	  h = winCtrl.oldHeight + dy;
	  if (w <= winCtrl.active.minimumWidth) {
		w = winCtrl.active.minimumWidth;
		dx = w - winCtrl.oldWidth;
	  }
	  if (h <= winCtrl.active.minimumHeight) {
		h = winCtrl.active.minimumHeight;
		dy = h - winCtrl.oldHeight;
	  }
	
	  // Resize the window. For IE, keep client area and frame widths in synch.
	
	  if (east || west) {
		winCtrl.active.frame.style.width = w + "px";
		if (browser.isIE)
		  winCtrl.active.clientArea.style.width = (w - winCtrl.active.widthDiff) + "px";
	  }
	  if (north || south)
		winCtrl.active.clientArea.style.height = h + "px";
	
	  // Clip the title bar text, if necessary.
	
	  if (east || west) {
		if (w < winCtrl.active.clipTextMinimumWidth)
		  winCtrl.active.titleBarText.style.width = (winCtrl.minimizedTextWidth + w - winCtrl.active.minimumWidth) + "px";
		else
		  winCtrl.active.titleBarText.style.width = "";
	
	  }
	
	  // For a north or west resize, move the window.
	
	  if (west)
		winCtrl.active.frame.style.left = (winCtrl.oldLeft - dx) + "px";
	  if (north)
		winCtrl.active.frame.style.top  = (winCtrl.oldTop  - dy) + "px";
	
	  if (browser.isIE) {
		window.event.cancelBubble = true;
		window.event.returnValue = false;
	  }
	  if (browser.isNS)
		event.preventDefault();
	}
	
	function winResizeDragStop(event) {
	
	  winCtrl.inResizeDrag = false;
	
	  // Remove mousemove and mouseup event captures on document.
	
	  if (browser.isIE) {
		document.onmousemove = null;
		document.onmouseup   = null;
	  }
	  if (browser.isNS) {
		document.removeEventListener("mousemove", winResizeDragGo,   true);
		document.removeEventListener("mouseup"  , winResizeDragStop, true);
	  }
	}
	
	//=============================================================================
	// Utility functions.
	//=============================================================================
	
	function winFindByClassName(el, className) {
	
	  var i, tmp;
	
	  if (el.className == className)
		return el;
	
	  // Search for a descendant element assigned the given class.
	
	  for (i = 0; i < el.childNodes.length; i++) {
		tmp = winFindByClassName(el.childNodes[i], className);
		if (tmp != null)
		  return tmp;
	  }
	
	  return null;
	}
	
	//=============================================================================
	// Initialization code.
	//=============================================================================
	
	var winList = new Array();
	var winCtrl = new Object();
	
	function winInit() {
	
	  var elList;
	
	  // Initialize window control object.
	
	  winCtrl.maxzIndex                        =   0;
	  winCtrl.resizeCornerSize                 =  16;
	  winCtrl.minimizedTextWidth               = 100;
	  winCtrl.inactiveFrameBackgroundColor     = "#c0c0c0";
	  winCtrl.inactiveFrameBorderColor         = "#f0f0f0 #505050 #404040 #e0e0e0";
	  winCtrl.inactiveTitleBarColor            = "#808080";
	  winCtrl.inactiveTitleTextColor           = "#c0c0c0";
	  winCtrl.inactiveClientAreaBorderColor    = "#404040 #e0e0e0 #f0f0f0 #505050";
	  winCtrl.inactiveClientAreaScrollbarColor = "";
	  winCtrl.inMoveDrag                       = false;
	  winCtrl.inResizeDrag                     = false;
	
	  // Initialize windows and build list.
	
	  elList = document.getElementsByTagName("DIV");
	  for (var i = 0; i < elList.length; i++)
		if (elList[i].className == "window"){
			//alert(elList[i].id);
		  winList[elList[i].id] = new Window(elList[i]);
		//  alert(winList[elList[i].id]);
		}
	}
	
	//window.onload = winInit;  // run initialization code after page loads.