function contentHoogte() {
	var schermbreedte = document.body.clientWidth;
		
	if (schermbreedte < 950) {
		var popupmenu_left = (schermbreedte - 780) / 2;
		document.getElementById("content_parent").style.width = "780px";
		
		document.getElementById("content_midden").style.left = "10px";
		document.getElementById("content_midden").style.width = "540px";
		document.getElementById("content_rechts").style.left = "570px";		
	} else {
		var popupmenu_left = (schermbreedte - 950) / 2;
		document.getElementById("content_parent").style.width = "950px";
		
		document.getElementById("content_midden").style.width = "710px";
		document.getElementById("content_midden").style.left = "10px";
		document.getElementById("content_rechts").style.left = "740px";
	}
	document.getElementById("logo").style.left = popupmenu_left + "px";
	document.getElementById("ondertitel").style.left = 50+popupmenu_left + "px";
	document.getElementById("popupmenu").style.left = 10+popupmenu_left + "px";
	
	document.getElementById("content_parent").style.height = (document.body.clientHeight - 125) + "px";
}