var JZ_Res = "a_640";	// Set default Screen resolution to 640x480 
	// Set default width and height to lowest screen resolution.
	var width = 640;
	var height = 480;

	//-----------------------------------------------------------------
	//	Dectect Browser (from: http://www.high.demon.nl/indexjs.html)
	//-----------------------------------------------------------------
	function getBrowser()
	{
		var bName = navigator.appName; 
		var bVer  = parseInt(navigator.appVersion); 

		if (bName == "Netscape" && bVer >= 4) return "nn4"; 
		if (bName == "Netscape" && bVer >= 3) return "nn3"; 
		if (bName == "Netscape" && bVer == 2) return "nn2"; 
		if (bName.indexOf('Microsoft') >= 0 && bVer >= 4) return "ie4"; 
		if (bName.indexOf('Microsoft') >= 0 && bVer >= 2) return "ie3";
		// add as needed
		return "x"
	}
	var sBrowswer = getBrowser();

	//-----------------------------------------------------------------
	//	Dectect Screen Resolution
	//-----------------------------------------------------------------
	function Detect_Browser_Resolution() 	
	{			
		// Netscape 4 and Explorer 4 have screen object which has width and height properties:
		if (self.screen) {
			width = screen.width;
			height = screen.height;
		}
		// In Netscape 3 it's possible to use java, of course it will work only if java is turned on:
		if (self.java && ( sBrowswer== "nn3") )   // is java enabled
		{
		       var jkit = java.awt.Toolkit.getDefaultToolkit();
		       var scrsize = jkit.getScreenSize();       
		       width = scrsize.width; 
		       height = scrsize.height; 
		}		
 
		// Dectect screen resolution.    				
		if (width<700)			    // 640x480	 "a_640"
		{	JZ_Res="a_640"; }
		else if (width>=800 && width<1024)  // 800x600	 "a_800"
		{	JZ_Res="a_640"; }	    
		else if (width>=1024 && width<1280) // 1024x768  "a_1024"
		{	JZ_Res="a_1024"; }	
		else {  JZ_Res="a_1024"; }
	}
	
	Detect_Browser_Resolution ();