var max_height = 0;
var divElements = document.getElementsByTagName('div');
for(i=0;i<divElements.length;i++)
{
	if(divElements[i].id != 'footer')
	{
		if(parseInt(divElements[i].offsetTop) +parseInt(divElements[i].offsetHeight) > max_height)
		{
			max_height = parseInt(divElements[i].offsetTop) +parseInt(divElements[i].offsetHeight);
		}
	}
}
var imgElements = document.getElementsByTagName('img');
for(i=0;i<imgElements.length;i++)
{
	if(parseInt(imgElements[i].offsetTop) +parseInt(imgElements[i].offsetHeight) > max_height)
	{
		max_height = parseInt(imgElements[i].offsetTop) +parseInt(imgElements[i].offsetHeight);
	}
}
document.getElementById('footer').style.top = (max_height+20)+'px';