function rollmeover(thesrc){
var finalsrc = "gfx/" + thesrc + "_over.jpg";
var bigsrc = "gfx/" + thesrc + "_image.jpg";

document.getElementById(thesrc).src=finalsrc;
document.getElementById('changeme').src=bigsrc;
}

function rollmeout(thesrc){
var finalsrc = "gfx/" + thesrc + ".jpg";
var bigsrc = "gfx/choosetopics.jpg";

document.getElementById(thesrc).src=finalsrc;
document.getElementById('changeme').src=bigsrc;
}

function sluitpopup() {
document.getElementById('popup').className="hidden";
}

function onsecondnav(id) {
	document.getElementById('td_'+id).className="";
}

function outsecondnav(id) {
	document.getElementById('td_'+id).className="hidden";
}