var hpBackgrounds = new Array() 
hpBackgrounds[0] = '0210.jpg'
hpBackgrounds[1] = '0204.jpg'
hpBackgrounds[2] = '0210-1.jpg'
hpBackgrounds[3] = '0210-2.jpg'


function hpBanner(){	
		var whichBanner = Math.round(Math.random()*(3));
			document.body.style.background="#ffffff url(/portals/0/images/backgrounds/"+hpBackgrounds[whichBanner]+") no-repeat";
			document.body.style.backgroundPosition="top center";
}