function hashdone(){

       var hash;

       hash=(!window.location.hash)?"#one":window.location.hash;

       window.location.hash=hash;

       var hashStr = location.hash.replace("#","");

       switch(hash){

           case "#one":

               alert(hashStr)

 

               break;

           case "#second":

               alert(hashStr)

 

               break;

           case "#third":

               alert(hashStr)

 

               break;

 

 

       }

   }

   hashdone()

 window.onhashchange=function(){

    hashdone()

 

 }