.watermark {
	position: relative;
	color:    #666;
}

.watermark_img {
	display:    block;
	position:   absolute;
	top:        0;
	left:       0;
	height:     100%;
	width:      100%;
	background: url(watermark.png);
}

* html .watermark_img {background: url(watermark.gif);}