function GetRequest()

         {

            var url = location.search; //获取url中"?"符后的字串

            var theRequest = new Object();

            if (url.indexOf("?") != -1) {

            var str = url.substr(1);

            strs = str.split("&");

            for(var i = 0; i < strs.length; i ++)

            {

              theRequest[strs[i].split("=")[0]]=unescape(strs[i].split("=")[1]);

            }

           }

          return theRequest;

       }

var Request = new Object();

Request = GetRequest();

if (typeof(Request['__Topic']) != "undefined")

{

   document.getElementById('__Topic').value = Request['__Topic'];

   if( Request['__first'] == 1)

   {

        document.getElementById('SearchForm').submit();

    }

 

}