function sizeHandler(){
	if(document.body.clientHeight<291){
			/*	document.getElementById('navigatie').style.height = 1 + "px";*/
				document.getElementById('contentDiv').style.height = 1 + "px";
			return false;
		}
	if(document.body.clientHeight>291){
			/* document.getElementById('navigatie').style.height = (document.body.clientHeight-340) + "px"; */
			document.getElementById('contentDiv').style.height = (document.body.clientHeight-340) + "px";
		}
}
window.onresize = sizeHandler;