this.randomtip = function(){
	var length = $("#randambanner li").length; // this is where we put the id of the list
	var ran = Math.floor(Math.random()*length) + 1;
	$("#randambanner li:nth-child(" + ran + ")").show();
};

$(document).ready(function(){	
	randomtip();
});

	
document.write("<ul id='randambanner'>");
document.write("<li><a href='http://www.sideriver.com/schott/' target='_blank'><img src='/ec/user_data/packages/default/img/randambanner/20120210_schott.jpg' width='728' height='90' alt='Schott Online' border='0' /></a></li>");
document.write("</ul>");