stretcher = function () {
		var links = document.getElementById("home_left").offsetHeight;
		var midden = document.getElementById("home_middle").offsetHeight;
		var rechts = document.getElementById("home_right").offsetHeight;	
		// zoeken van de grootste
		if(links > midden){
			if(links > rechts){
				var grootste = links;
			}
			else{
				var grootste = rechts;
			}
		}
		else{
			if(midden > rechts){
				var grootste = midden;
			}
			else{
				var grootste = rechts;
			}
		}
		var stretch_links = grootste - links + 25;
		document.getElementById("stretch_links").style.height = stretch_links +"px";
		
		var stretch_midden = grootste - midden + 25;
		document.getElementById("stretch_midden").style.height = stretch_midden +"px";
		
		var stretch_rechts = grootste - rechts + 25;
		document.getElementById("stretch_rechts").style.height = stretch_rechts +"px";
		
	}
window.onload = stretcher;