function main(){
	document.invul.pc.focus();
}

function showAdv(num){
	var h = document.body.scrollHeight;
	document.getElementById('advertentie').style.height = h;
	document.getElementById('advFoto').src = "/imgs/adv_"+num+".jpg";
	document.getElementById('advertentie').style.display = 'block';
	}
	
function closeAdv(){
	document.getElementById('advFoto').src = "/imgs/leeg.gif";
	document.getElementById('advertentie').style.display = 'none';
	}