function changeClass(item_naam,class_ori,class_new){

	if(document.getElementById(item_naam).className == class_ori){
		document.getElementById(item_naam).className=class_new
	} else {
		document.getElementById(item_naam).className=class_ori
	}
}

function changeBackground(number){
	document.getElementById('background').src = "./mme/upload/background-" + number + ".jpg";
	setTimeout('changeBackground(number)', 12250); 
}