document.onmousemove=function(){
   var e = event.srcElement;
   var c = event.srcElement;
   if(e.tagName=="TEXTAREA"||c.className=="Text"){event.srcElement.style.backgroundColor="#FFF"}
}
document.onmouseout=function(){
   var e = event.srcElement;
   var c = event.srcElement;
   if(e.tagName=="TEXTAREA"||c.className=="Text"){event.srcElement.style.backgroundColor="#F5FCF4"}
}
function Feedback(){
 var e = document.myform;
  if(IsNull(e.Name.value)){
     alert('姓名不能为空!');
     e.Name.focus();
     return;
  }
  if(IsNull(e.Tel.value)){
     alert('电话不能为空！');
     e.Tel.focus();
     return;
  }
  if(IsNull(e.Content.value)){
     alert('留言内容不能为空！');
     e.Content.focus();
     return;
  }
  if(!IsEmail(e.Email.value)){
     alert('请输入正确的Email地址！');
     e.Email.focus();
     return;
  }
  e.submit();
}