var numImages = 5;	// the number of random images available
	var horizDisplacement = 100;	// the horizontal displacement of the image
	var rndImage = "header_" + Math.floor( Math.random() * numImages + 1 ) + ".jpg";
	document.write("<style type='text/css' title='text/css'> #header { background-image: url(http://www.ucdavis.edu/images/header_photos/" + rndImage + "); background-repeat: no-repeat; background-position: " + horizDisplacement + "px 0px; } </style>");
	//document.write("<style type='text/css' title='text/css'><!-- #header { background-image: url(http://www.ucdavis.edu/images/header_photos/" + rndImage + "); background-repeat: no-repeat; background-position: " + horizDisplacement + "px 0px; } // --> </style>");