/* 		Meet hoogte van actief browservenster als variabele      		*/
/* 		en trekt hiervan de hoogte van header, menu en footer af 		*/
/* 		Hierdoor is hoogte van contentDiv (mainvlak) dynamisch   		*/

/* initialisatie / eventlistener */
window.onload=function(){	 	
	setContentHeight();
}
window.onresize=function(){
	setContentHeight();
}

function getWindowHeight() {
	var windowHeight=0;
		if (typeof(window.innerHeight)=='number') {
			windowHeight=window.innerHeight;
		}
		else {
		if (document.documentElement&& document.documentElement.clientHeight) {
			windowHeight=document.documentElement.clientHeight;
		}
		else {
		if (document.body&&document.body.clientHeight) {
			windowHeight=document.body.clientHeight;
		}
		}
	}
	return windowHeight; 
}

function setContentHeight() {
	if (document.getElementById) {
		var windowHeight=getWindowHeight();
		if (windowHeight>0) {
			var contentElement=document.getElementById('contentbody');
			var contentElementHeight=contentElement.Height;
			var contentHeight=(windowHeight-160)+'px';					
			document.getElementById('contentbody').style.height=contentHeight;	
		}
	}
}