window.addEventListener?window.addEventListener("load",randomfade,false):window.attachEvent("onload",randomfade);
	
function randomfade(){
		
		var rn = Math.round(3*Math.random()+1);
		var	frontid = 'frontsq'+rn;
		opacity(frontid,'100','0',3000);
		}	
		
		function opacity(frontid, opacStart, opacEnd, millisec) {
   		var speed = Math.round(millisec / 100);
    	var timer = 0;

        for(i = 100; i >= 0; i--) {
            setTimeout("changeOpac(" + i + ",'" + frontid + "')",(timer * speed));
            timer++;
        }
 
        for(i = 0; i <= 100; i++) {
            setTimeout("changeOpac(" + i + ",'" + frontid + "')",(timer * speed));
            timer++;
        }  
        imgfade = setTimeout("randomfade()",5000);
		}

		function changeOpac(opacity, frontid) {
   	 	var object = document.getElementById(frontid);
   		object.style.opacity = (opacity / 100);
    	object.style.MozOpacity = (opacity / 100);
    	object.style.KhtmlOpacity = (opacity / 100);
    	object.style.filter = "alpha(opacity=" + opacity + ")";
		}