var minimumInterval=50000;
var maximumInterval=100000;

function isIE(){
	var a = navigator.appName;
	a = a.toLowerCase();
	return (a.indexOf('microsoft') >= 0);
}

function startRandomAnimation() {
	if(!isIE()) return;
	
	animationID=Math.round(Math.random()*3);
	setTimeout("showAnimation(animationID)", minimumInterval + Math.round(Math.random()*(maximumInterval-minimumInterval)));
}

function offset() {
	if (window.pageYOffset) return parseInt(window.pageYOffset);
	if (document.documentElement && document.documentElement.scrollTop) return parseInt(document.documentElement.scrollTop)+parseInt(document.body.scrollTop);
	return parseInt(document.body.scrollTop);
}