var interval = 60000;
    function rotateAdds(){
    	var adds = ["bannerAdd", "skyScraperAdd"];
    	for(var i=0; i<adds.length; i++){
    		setTimeout("rotateOnce('" + adds[i] + "')", (i+1)*interval);
    		if(i==adds.length-1){
    			setTimeout("rotateAdds()", interval*2)
    		}
    	}
    }

    function rotateOnce(id){
    	var elem = document.getElementById(id);
		if(elem) elem.src = elem.src;
    }

	var onLoadBeforeAddRotations = window.onload;
	window.onload = function(){
		if(onLoadBeforeAddRotations) onLoadBeforeAddRotations();
		rotateAdds();
	}