function GET_HTTP_QueryString(Query_String_Name) {
	 var i, pos, argname, argvalue, queryString, pairs;
	 // get the string following the question mark
	 queryString = location.href.substring(location.href.indexOf("?")+1);
	 // split parameters into pairs, assuming pairs are separated by ampersands
	 pairs = queryString.split("&");
	 // for each pair, we get the name and the value
			for (i = 0; i < pairs.length; i++) { 
		  pos = pairs[i].indexOf('='); 
		  if (pos == -1) {
		  continue; 
		  }
		  argname = pairs[i].substring(0,pos);
		  argvalue = pairs[i].substring(pos+1); 
		// Replaces "Google-style" + signs with the spaces they represent
			if (argname == Query_String_Name) {
			   return unescape(argvalue.replace(/\+/g, " "));
			}
		}
		return false;
}