// popup organogram
function popupWindow(theURL, windowWidth, windowHeight) {  
  window.open(theURL,'reageer','toolbar=no, location=no, status=no, menubar=no, scrollbars=no, resizable=yes, width=' + windowWidth + ', height=' + windowHeight);  
}  

function emptyField(form, fieldValue) {
	if (form.emailadres.value == fieldValue){
		
		form.emailadres.value = "";
		
	}
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		
		// update
		menu_home_over = newImage("img/menu_home-over.png");
		menu_watisvinylized_over = newImage("img/menu_watisvinylized-over.png");
		menu_winnaars_over = newImage("img/menu_winnaars-over.png");
		menu_finalisten_over = newImage("img/menu_finalisten-over.png");
		menu_organistie_over = newImage("img/menu_organistie-over.png");
		
		preloadFlag = true;
	}
}