var randomArray = new Array();
		  randomArray = [2,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,44,46,48,50,52,54,56,58,60];
		
			function randomBannerImage(folder,abrv,alt) {
				var randomNumber = Math.floor(Math.random()*(randomArray.length-1)+1);
				
				document.write("<img src='images/"+folder+"/"+abrv+randomArray[randomNumber]+".jpg' alt='"+alt+"' class='image-center image-border' />");
				
			}