var imageFolder = "//web.byui.edu/css/v1/images/Students_small/";             
var imageList = new Array('student0.gif','student1.gif','student2.gif','student3.gif','student4.gif','student5.gif','student6.gif','student7.gif','student8.gif','student9.gif','student10.gif','student11.gif','student12.gif','student13.gif','student14.gif','student15.gif','student16.gif');
var whichImage = imageList[parseInt(Math.random()*(imageList.length))];   
document.writeln("<div id='StudentPic' style='background:transparent url("+imageFolder+whichImage+") no-repeat;'><span></span></div>");