function doRotate() {
	var ad_cnt = 7;//maximum number of images. 1-based
	var randomnumber=Math.floor(Math.random()*ad_cnt)+1;
	
	document.getElementById('splash_headerImg').style.backgroundImage = "url('/images/wastewater-ad-2009-" + randomnumber + ".jpg')";
	
	var addresses = new Array();
		addresses[1] = "/environment/strategy.htm";
		addresses[2] = "/environment/flow-energy.htm";
		addresses[3] = "/inthecrd/schedule.htm";
		addresses[4] = "/environment/flow-energy.htm";
		addresses[5] = "/environment/wastewater-reuse.htm";
		addresses[6] = "/inthecrd/goals.htm";
		addresses[7] = "/environment/strategy.htm";

	document.getElementById('splash_headerImg_link').href = addresses[randomnumber];
};