#parallax-header { 
	height:200px; background-color:gray; 
 }
#parallax {
	position:relative; overflow:hidden; width:950px; height:250px;
	background-image:url('images/background.jpg');
}
.parallax-viewport {
	position: relative;     /* relative, absolute, fixed */
	overflow: hidden;
}
.parallax-layer {
	position: absolute;
}