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];}}
}

function changeColor(){
	document.getElementById('activiteit').style.color='#ffffff';
}
function changeBack(){
	document.getElementById('activiteit').style.color='#000000';
}

function displaySub(id){
	document.getElementById(id+'_sub').style.display='block';
}

function hideSub(id){
	document.getElementById(id+'_sub').style.display='none';
}