[Website] Need some help with css

[EQ8]

Why can't i get my header picture to fit the frame on my webpage

(back-link in friends!)

This is my settings

/* begin Header */
div.art-Header
{
	margin: 0 auto;
	position: relative;
	z-index:0;
	width: 1000px;
	height: 300px;
}


div.art-Header-jpeg
{
	position: relative;
	z-index:0;
	top: 0;
	left: 0;
	width: 100%;
	height: 300px;
	background-image: url('../images/Header.jpg');
	background-attachment:inherit;
	background-repeat: no-repeat;
	background-position: center;
}
/* end Header */

I'm new to css so any help is great!

edit - Solved, moderator can close the thread!