function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

var timerID = null; 
var timerOn = false; 
var timecount = 2000; 

function showLayer(layerName) { 
	
	obj=document.getElementById(layerName);
	if (obj)
	document.getElementById(layerName).style.visibility="visible"; 

}


function hideLayer(layerName) {
	obj=document.getElementById(layerName);
	if (obj)
	 document.getElementById(layerName).style.visibility="hidden";

}


function hideAll() { 

	hideLayer('menu_home'); 
	hideLayer('menu_vervoer'); 
	hideLayer('menu_bouwsector'); 
	hideLayer('menu_industrie');
	hideLayer('menu_zwembaden'); 
	hideLayer('menu_contacten');
	hideLayer('menu_downloads');
	 
	

	if (active != ''){
		obj=document.getElementById(active);
		if (obj)
		document.getElementById(active).style.visibility="visible"; stopTime();
	}
 } 

function stopTime() { 
	if (timerOn) { 
		clearTimeout(timerID); 
		timerID = null; 
		timerOn = false; 
	} 
 }


function startTime() { 
	if (timerOn == false) { 
		timerID=setTimeout( "hideAll()" , timecount); 
		timerOn = true; 
	} 
 }