function loadPage(url,divPlace){
	if(window.XMLHttpRequest)
	{
		http_request=new XMLHttpRequest();
	}else if(window.ActiveXObject)
	{
		try
		{
			http_request=new ActiveXObject('Msxml2.XMLHTTP')
		}catch(e)
		{
			http_request=new ActiveXObject('Microsoft.XMLHTTP');
		}
	}
	if(http_request)
	{
		http_request.onreadystatechange=function(){
			if(http_request.readyState==4)
			{
				if(http_request.status==200)
				{
					
					if (window.navigator.userAgent.indexOf("Firefox") >= 1) //针对FF 
					{
						document.getElementById(divPlace).innerHTML = http_request.responseText;
						var scripts = document.getElementById(divPlace).getElementsByTagName("script"); 
                        for(var i=0;i <scripts.length;i++) //一段一段执行script 
                       { 
                        	eval(scripts[i].innerHTML); 
                       } 
					} else if (window.navigator.userAgent.indexOf("MSIE") != -1) {
						var httpText = http_request.responseText;
						httpText = httpText.replace(/ <script[^>]*>/gi," <script defer>");
						document.getElementById(divPlace).innerHTML = httpText;
					} 
				}
			}
		}
		http_request.open('GET',url,true);
		http_request.send(null);
	}
	
}

function delULContext(){
	var u1=document.getElementById("u1");
	var u2=document.getElementById("u2");
	var u3=document.getElementById("u3");
	
	if(u1.innerHTML.replace(" ","")==""){
		u1.style.display="none";
	}
	if(u2.innerHTML.replace(" ","")==""){
		u2.style.display="none";
	}
	if(u3.innerHTML.replace(" ","")==""){
		u3.style.display="none";
	}
	
}