function markieren (c) {
for (i=1; i<17 ; i++ ) {
document.getElementById(i).style.background="none";
}
if (c < 17) {
document.getElementById(c).style.background="#DFDFDF";
}
return
}

function angebotfenster() {
if(typeof(fensta) != "object" || fensta.closed) {
fensta = window.open("anfrageformular.php","fensta", "width=780, height=708, left=285, top=0, resizable=yes, status=no, scrollbars=yes");
}
fensta.focus();
}
function kontaktfenster() {
if(typeof(fenster) != "object" || fenster.closed) {
fenster = window.open("kontaktformular.html","fenster", "width=700, height=520, left=335, top=0, resizable=yes, status=no, scrollbars=yes");
}
fenster.focus();
}