window.onload = Load;
function Load()
{
   var header = Thing('header');
   var footer = Thing('footer');
   var kolomlinks = Thing('kolomlinks');
   var kolomrechts = Thing('kolomrechts');
   var contentblok = Thing('contentblok');

   var maxColumnHeight = Math.max(kolomlinks.offsetHeight, contentblok.offsetHeight,kolomrechts.offsetHeight)

   var siteHeight = header.offsetHeight + maxColumnHeight + footer.offsetHeight;

   var windowHeight = measure('window').y;
   var siteOverflow = windowHeight < siteHeight;
   var remainingHeight = windowHeight - header.offsetHeight - footer.offsetHeight;
   var goalHeight = 0;

	// de hoogte instellen, verschillend per browser
	goalHeight = siteOverflow? maxColumnHeight : remainingHeight;

	kolomlinks.style.height = goalHeight + 'px';
	contentblok.style.height = goalHeight - 20 + 'px';
	kolomrechts.style.height = goalHeight + 'px';
	document.getElementById('logintaal').style.top = parseInt(kolomlinks.style.height) - 65 + "px";
}