// popup
function popupje(url,naam,breedte,hoogte,resizable,toolbar,menubar,scrollbar,status,location) {
	//pleklinks = (screen.width)?(screen.width-breedte)/2:0;
	//plektop = (screen.height)?(screen.height-hoogte)/2:0;
	if (resizable == null) resizable = "no";
	if (toolbar == null) toolbar = "no";
	if (menubar == null) menubar = "no";
	if (scrollbar == null) scrollbar = "no";
	if (status == null) status = "no";
	if (location == null) location = "no";
	OpenWindow = window.open(url, naam, 'width=' + breedte + ',height=' + hoogte + ',resizable=' + resizable + ', toolbar=' + toolbar + ', menubar=' + menubar+ ', scrollbars=' + scrollbar + ', status=' + status + ', location=' + location + ',left=0, top=0');
}
function showYouTube(divnaam){
	new Effect.toggle(divnaam,'appear');
}