function detectBrowsers()
{
	var ie, ie4, ie5x, ie6x, ie7x, op, firefx;
	var version;

	version = 0;


	var agent = navigator.userAgent.toLowerCase();
	//alert("agent is " + agent);

	var isIE = (agent.indexOf('msie') != -1);
	var isFirefox = (agent.indexOf('firefox') != -1);
	var isOpera = (agent.indexOf('opera') != -1);



	if(document.getElementById)
	{
		//alert("W3C browser");

		if(isIE)
		{
			//alert("ie browser");
			temp = agent.split("msie");
			
			version = "ie" + parseFloat(temp[1]);
			//alert ("version returned to function is " + version);
			 return version;
		}
		else if(isFirefox)
		{
			//alert("firefox browser");
			var versionindex=navigator.userAgent.indexOf("Firefox")+8
				
			var level = navigator.userAgent.charAt(versionindex); // getting first digit in level
			//alert("charactger is " + word);
			version = "firefox" + level;
			//alert("version index is " + level);
			return version;

			
		}
		else if(isOpera)
		{
			//alert("opera browser");
			var versionindex=navigator.userAgent.indexOf("Opera")+6;
				//alert("version of opera is " + versionindex);
				
			var level = navigator.userAgent.charAt(versionindex); // getting first digit in level
			//alert("charactger is " + word);
			version = "opera" + level;
			//alert("version index is " + level);
			return version;

			
		}

		

	}
	else if(document.layers)
	{
		alert("netscape browser");
	}
	else if(document.all)
	{
		//alert("internet explorer");
	}
}