function disableButtons(){
      var theForm = document.forms['aspnetForm'];
      if (!theForm) {
        theForm = document.aspnetForm;
      } 
      //alert(theForm.elements.length);
      for(var i=0;i<theForm.elements.length;i++){
        if(theForm.elements[i].type.toLowerCase() == "submit"){
          theForm.elements[i].style.visibility = "hidden";
          //theForm.elements[i].disabled = true;
          //alert(theForm.elements[i].value);
        }
      }
      return true;
    }