function back_link(){
	
	
//a simple check for Internet Explorer: use conditional comments in the HTML to set this to the version number
//var IEVersion;

//PPK's browser detect script, modified
//http://www.quirksmode.org/js/detect.html

	
	
	var BrowserDetect = function()
	{
		//***** private properties and methods *****//
		
		var versionSearchString;
		function searchString(data)
		{
			var dataString, dataProp;
			for(var i=0; i<data.length; i++)
			{
				dataString = data[i].string;
				dataProp = data[i].prop;
				versionSearchString = data[i].versionSearch || data[i].identity;
				if(dataString)
				{
					if(dataString.indexOf(data[i].subString) != -1) return data[i].identity;
				}
				else if(dataProp) return data[i].identity;
			}
		}
		function searchVersion(dataString)
		{
			var index = dataString.indexOf(versionSearchString);
			if(index == -1) return;
			return parseFloat(dataString.substring(index+versionSearchString.length+1));
		}
		
		var dataBrowser = [
			{
				string: navigator.userAgent,
				subString: "Chrome",
				identity: "Chrome"
			},
			{
				string: navigator.userAgent,
				subString: "OmniWeb",
				versionSearch: "OmniWeb/",
				identity: "OmniWeb"
			},
			{
				string: navigator.vendor,
				subString: "Apple",
				identity: "Safari"
			},
			{
				prop: window.opera,
				identity: "Opera"
			},
			{
				string: navigator.vendor,
				subString: "iCab",
				identity: "iCab"
			},
			{
				string: navigator.vendor,
				subString: "KDE",
				identity: "Konqueror"
			},
			{
				string: navigator.userAgent,
				subString: "Firefox",
				identity: "Firefox"
			},
			{
				string: navigator.vendor,
				subString: "Camino",
				identity: "Camino"
			},
			{		// for newer Netscapes (6+)
				string: navigator.userAgent,
				subString: "Netscape",
				identity: "Netscape"
			},
			{
				string: navigator.userAgent,
				subString: "MSIE",
				identity: "Explorer",
				versionSearch: "MSIE"
			},
			{
				string: navigator.userAgent,
				subString: "Gecko",
				identity: "Mozilla",
				versionSearch: "rv"
			},
			{ 		// for older Netscapes (4-)
				string: navigator.userAgent,
				subString: "Mozilla",
				identity: "Netscape",
				versionSearch: "Mozilla"
			}
		];
		var dataOS = [
			{
				string: navigator.platform,
				subString: "Win",
				identity: "Windows"
			},
			{
				string: navigator.platform,
				subString: "Mac",
				identity: "Mac"
			},
			{
				string: navigator.platform,
				subString: "Linux",
				identity: "Linux"
			}
		];
		
		//***** public properties and methods *****//
		
		return {
			browser: searchString(dataBrowser) || "",
			version: searchVersion(navigator.userAgent) || searchVersion(navigator.appVersion) || "",
			OS: searchString(dataOS) || ""
		};
	}();	//initialize BrowserDetect
	
	
	if(BrowserDetect.browser == "Firefox"){
		//alert('You are using Firefox. Going back ONE page');	
		history.back();	
	}else if(BrowserDetect.browser == "Explorer"){
		//alert('You are using Explorer. Going back TWO page');
		history.go(-2);
	}
	
}