function objectByID(id) {
	var returnVar;
	if (document.getElementById) {
		returnVar = document.getElementById(id);
	} else if (document.all) {
		returnVar = document.all[id];
	}	
	return returnVar;
}

function adexpand() {
	var skyscraper = objectByID("skyscraper");
	skyscraper.style.left = "618px";
	skyscraper.style.width = "400px";
}

function adcollapse() {
	var skyscraper = objectByID("skyscraper");
	skyscraper.style.left = "858px";
	skyscraper.style.width = "160px";
}