function showBackGroundJsp(url,showid){
	if( url.indexOf(".jsp?") == -1 )
		url += "?t=" ;
	else
		url += "&t=" ;
	url += Math.random();
	var request = new XMLRequst(url , "get").createXMLRequst();
	request.onreadystatechange = function(){
			try{
				if(request.readyState == 4){//over
					if (request.status == 200){
						var text = request.responseText.trim();
						if(text != ''){
							g(showid).style.display = "";
							g(showid).innerHTML = request.responseText.trim();
						}
					}
				}
			}catch(e){
				throw e;
			}
	};
	request.send(null);
}