function Position_top(element) { 
	var valueT = 0; 
	do {
		valueT += element.offsetTop || 0;
    		element = element.offsetParent;
	} while (element);
	return valueT;
}
function roll_credits(){
	var h = 310;
	credits_interval = window.setInterval(function() { 
		h -= 4;
		document.getElementById("scroll-text").style.top = h+"px";
		var thanks = document.getElementById("thankyou");
		if (Position_top(thanks)<200) { 
			clearInterval(credits_interval);
			setTimeout(function() {
				document.location.href="blank.html";
				window.top.GB_hide();
			},6000);
		}
	},100);
}