function initBlaTowerBanner() {
	window.onscroll = repositionBlaTowerBanner;
	repositionBlaTowerBanner();
}

function repositionBlaTowerBanner() {
	
	var pageLocationX = findPos( document.getElementById("mainContainer") )[0];
	var topOffset = document.documentElement.scrollTop > 0 ? document.documentElement.scrollTop : document.body.scrollTop;

	var bannerElem = document.getElementById('blaTowerBanner')
	bannerElem.style.top = topOffset + 'px';
	bannerElem.style.left = (pageLocationX + 989)+"px";
	bannerElem.style.display = "";
}

function findPos(obj)
{
	var curleft = curtop = 0;
	if (obj.offsetParent)
	{
		do
		{
			curleft += obj.offsetLeft;
			curtop += obj.offsetTop;
		}
		while (obj = obj.offsetParent);
	}
	return [curleft,curtop];
}