hide div is show

hide div is show

Hello Everybody,

My English is not so very good, so my apologize.
But I have a question.
I have a div which has been hide by jquery like this:
$(".msg_body").hide();

But when I refresh or open the website I see very quick the div and then it's been hide.
Is this a common thing in JQuery?

Css of the div is:
.msg_body
{
width: 100%;
height: 175px;
background: #ed62a5;
margin-top: 0px;
color: #FFFFFF;
text-align: left;
}

I really appreciate your help!

Nick