function setcookie(name,value)
   {  
     var Days = 30;  
     var exp  = new Date();  
     exp.setTime(exp.getTime() + Days*24*60*60*1000);  
     document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();  
     //alert(document.cookie);
   }
   function getcookie(name)
   {  
       var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));   
       if(arr != null)
       {  
           return unescape(arr[2]);  
       }
       else
       {  
           return "";  
       }  
   } 
   function delcookie(name)
   {  
       var exp = new Date();   
       exp.setTime(exp.getTime() - 10000);  
       document.cookie = name + "=a; expires=" + exp.toGMTString();
     
   }