window.onresize=resizefloat();

function resizefloat()
{
	footer = document.getElementById('footer');
	overdiv = document.getElementById('overdiv');
	
	foot_top = findpos(footer,'top');
	overdiv.style.height = foot_top - 100;
}

function findpos(obj,which) 
{
	var curleft = curtop = 0;
	if (obj.offsetParent) 
	{
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent) 
		{
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	}
	
	if (which == 'left')
		return curleft;
	else if (which == 'top')
		return curtop;
}

function ele(element)
{
	return document.getElementById(element);
}

function val(element)
{
	return document.getElementById(element).value;
}