function IsValid(){
   try{
      var el=document.forms['form1'].elements;
      if(Trim(el['email'].value)==''||Trim(el['subject'].value)==''||
         Trim(el['message'].value)==''){
         alert('All fields are required to continue.');
         return false;
      }
      return true;
   }catch(e){
      return false;
   }
}