img1 = "/figuren/arrow-down.gif";
img2 = "/figuren/arrow-up.gif";
function chng(c_img) {
if (document[c_img].src.indexOf(img1)!= -1) document[c_img].src = img2;
else document[c_img].src = img1;
}


/*
 * Hieronder toegevoegd om driehoekje in rechtermenu werkend te krijgen
 */


img3 = "/figuren/arrow-down-white.gif";
img4 = "/figuren/arrow-up-white.gif";
function chng2(c_img) {
if (document[c_img].src.indexOf(img3)!= -1) document[c_img].src = img4;
else document[c_img].src = img3;
}