window.onload = function () {
	setMenuOffset();
	window.onscroll = document.documentElement.onscroll = setMenuOffset;
}

function setMenuOffset() { 
	var currentOffset = document.documentElement.scrollTop || document.body.scrollTop; // body for Safari
	var ads = document.getElementById('ads');
	if (!ads) return;
//	header.innerHTML += ' ' + currentOffset;	
	var desiredOffset = 325 - currentOffset;
	if (desiredOffset < 12)
		desiredOffset = 12;
	if (desiredOffset != parseInt(ads.style.top)) 
		ads.style.top = desiredOffset + 'px';

	//var currentLeftOffset = document.documentElement.scrollLeft || document.body.scrollLeft; // body for Safari
	//if (currentLeftOffset != - parseInt(ads.style.left))
		//ads.style.left = '-' + currentLeftOffset + 'px';
}