function Check(theForm){
	if(theForm.Subject.value == "") {
		alert("标题不能为空!");
		return false;
	}
     if(theForm.Ly.value == "") {
		alert("留言不能为空,请你重新填写!");
		return false;
	}
	
	if(theForm.UserName.value == "") {
		alert("联系人不能为�?请你重新填写!");
		return false;
	}
	if(theForm.Email.value == "") {
		alert("Email不能为空,请你重新填写!");
		return false;
	}
		
   }
function checkemail(theForm) { 
 if(chekemail(theForm.Email.value)==false) { 
  alert("您的邮箱格式有错误，请正确输�?"); 
  theForm.Email.focus(); 
  return false; 
 }

}
function chekemail(temail) { 
 var pattern = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/; 
 if(pattern.test(temail)) { 
  return true; 
 } 
 else { 
  return false; 
 } 
}