Jquery - Simple Fade effect

[Kavvson]

How can i add a simple fade effect on a image..

When you enter the page.. There will be a .fadeIn(time)

Since mine

<script>
$(document).ready(function() {
$('#header').fadeIn(7000)
}
)
</script> 
<div id="header" ></div>
</div>

dont work

 

[Paxton]

Because the image must not be visible when entering.

<div id="header" style='display: none;'></div>

 

[Kavvson]

Great Paxi!