function checkLayout()
{
	var content = document.getElementById('content');
	var subnav = document.getElementById('subnavigation');
	var sidebar = document.getElementById('sidebar');
	
	var highest = getHighest(sidebar, subnav);
	
	if( !isHigher(content, highest) )
	{
		content.style.height = highest.offsetHeight + "px!important";
	}
	
}

function getHighest(e1, e2)
{
	return (e1.offsetHeight > e2.offsetHeight)?e1:e2
}

function isHigher(e1, e2)
{
	return (e1.offsetHeight > e2.offsetHeight)?true:false
}

window.onload = checkLayout;