var XMLHttpRequestObject = false;
        if (window.XMLHttpRequest){
 	                XMLHttpRequestObject = new XMLHttpRequest();
  }else if (window.ActiveXObject){
	XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");
                                  }  
function switchmenu(obj){
 if(document.getElementById){				 						 
		var  srcData = "include_menu.asp?pro="+obj+"&on=0";
		var el = document.getElementById(obj);
        var ar = document.getElementById("maindiv").getElementsByTagName("span");
        for (var i=0; i<ar.length; i++){                    
                 ar[i].innerHTML = '';
              }
		 if(XMLHttpRequestObject){
			 XMLHttpRequestObject.open("GET", srcData, true);
		     XMLHttpRequestObject.onreadystatechange = function(){
		 if(XMLHttpRequestObject.readyState == 4 && XMLHttpRequestObject.status == 200){
                           el.innerHTML=XMLHttpRequestObject.responseText;				
				        }
		        }
		    XMLHttpRequestObject.send(null);
	              }     
           }
}