[Plugin: WP sIFR] Using a background image w/ SIFR

Can we use this to create text with a background image at the bottom?

.portfolio h1 {
	width:100%;
	height:auto;
	margin:0 0 25px 0;
	font-weight:normal;
	font-size:18px;
	padding:0 0 20px 0;
	background:url(images/home_cont_top.jpg) repeat-x left bottom;
	}

Not sure exactly how to use that background URL … Thoughts?