var strURL = location.href;  
 var searchhttp = strURL.lastIndexOf("http");  
 if( searchhttp == 0 )  
 {  
 strURL = strURL .substring(7);  
 }  
 var serchstr = strURL.lastIndexOf("www.");  
 if( serchstr < 0 )  
 {  
 //alert("www." + strURL);  
 var strnewURL = "http://www." + strURL;  
 window.location.assign (strnewURL);  
 }