javascript simulated query string

function getRequest(requestName) 
{ 
     var url=location.search.toLowerCase(); 
     var Request = new Object(); 

     if(url.indexOf("?")!=-1){ 
          var str=url.substr(1);
          strs = str.split("&"); 
          for(var i=0;i＜strs.length;i++){    
               Request[strs[i].split("=")[0]]=unescape(strs[i].split("=")[1]);
          }    
     } 
     return(Request[requestName]); 

}