var aantal = '1';
var zichtbaar = '1';
var vertraginga;
var vertragingb;
function showSubnav(tmpa){
	tmp2a = tmpa;
	clearTimeout(vertraginga);
	vertraginga = setTimeout('ChangeNow(tmp2a,\'1\')',100);
}
function hideSubnav(tmpb){
	zichtbaar = '0';
	tmpb2 = tmpb;
	clearTimeout(vertraginga);
	clearTimeout(vertragingb);
	vertragingb = setTimeout('ChangeNow(tmpb2,\'0\')',500);
}

function ChangeNow(welke,zien){
	if(document.getElementById){
		if(zien == '0' && zichtbaar != '1'){
			for(var i=1;i<=aantal;i++){
				document.getElementById('sub'+i).style.visibility = 'hidden';
				document.getElementById('sub'+i).style.display = 'none';
			}
		}else{
			for(var i=1;i<=aantal;i++){
				document.getElementById('sub'+i).style.visibility = 'hidden';
				document.getElementById('sub'+i).style.display = 'none';
			}
			document.getElementById('sub'+welke).style.visibility = 'visible';
			document.getElementById('sub'+welke).style.display = 'block';
			zichtbaar = '1';
			clearTimeout(vertragingb);
		}
	}
}

		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 setFooter() {
			if (document.getElementById) {
				var windowHeight = getWindowHeight();
				if (windowHeight > 0) {
					var footerElement = document.getElementById('left');
						footerElement.style.position = 'relative';
						footerElement.style.height = (windowHeight - 120) + 'px';
				}
			}
		}

		window.onload = function() {
			setFooter();
		}
		window.onresize = function() {
			setFooter();
		}

		function Confirm(varURL)
		{
			if (confirm("Weet u zeker dat u de pagina wil verlaten zonder het bericht op te slaan?"))
			{
				window.open(varURL, "_top");
				return true;
			}
			return false; 
		}