function __myDoPostBack(eventTarget, eventArgument) {
    showCover("正在提交，请稍候");
  var theForm;
   theForm = document.forms[0];
  theForm.__EVENTTARGET.value = eventTarget.split("$").join(":");
  theForm.__EVENTARGUMENT.value = eventArgument;
/*  if (typeof(theForm.onsubmit) != ""undefined"") 
  {
     theForm.onsubmit();

    var myEventObj=document.createEventObject();
    theForm.fireEvent('onsubmit',myEventObj);
		if(myEventObj.returnValue!=false)//验证成功 
		  theForm.submit(); 
  }
	else*/   
   $(theForm).submit(); 
 }
 __doPostBack = __myDoPostBack;