A small problem with Mozzila?

A small problem with Mozzila?

I have a div which when opening a page comes on the page from the right.
Everything works fine when the position of that element in CSS is a start animation position.(left:1170px;)

But to make possible for those who don't have Java  to see the contents of that div,
I've written in CSS the right position to which an element has to come (left:150px;).
In the first line of jquery code I've then put the same div to the start animation position.
$('#gallery').css("left","1170px");


Everything works ok on the most of browsers except for Mozzila which, when you first come on the page, shows
that div for a moment and then animates it.

Here's the code:
css:
#gallery{
 top: 8px;
 left:150px;
 position:absolute;
 height:276px
}
js:







$(document).ready(function() {   
 
$('#gallery').css("left","1170px");
 $('#gallery').animate({
    left: '-=1020'
  
  }, 500, function() {
    // Animation complete.
  });
});






Does anyone have any suggestions?
THNX