function updatepic(active,newsource) {
 document.getElementById('wiezijnwe').setAttribute("src","images/but_wiezijnwe_inactive.jpg");
 document.getElementById('grafzerken').setAttribute("src","images/but_grafzerken_inactive.jpg");
 document.getElementById('offerte').setAttribute("src","images/but_offerte_inactive.jpg");
 document.getElementById('india').setAttribute("src","images/but_india_inactive.jpg");
 document.getElementById('toonplaats').setAttribute("src","images/but_toonplaats_inactive.jpg");
 document.getElementById(active).setAttribute("src",newsource);
}
function overpic(source) {
 document.getElementById(source).setAttribute("src","images/overindicator.jpg");
}
function outpic(source) {
 document.getElementById(source).setAttribute("src","images/spacer.gif");
}
function resetmain() {
 top.topFrame.document.getElementById('wiezijnwe').setAttribute("src","images/but_wiezijnwe_inactive.jpg");
 top.topFrame.document.getElementById('grafzerken').setAttribute("src","images/but_grafzerken_inactive.jpg");
 top.topFrame.document.getElementById('offerte').setAttribute("src","images/but_offerte_inactive.jpg");
 top.topFrame.document.getElementById('india').setAttribute("src","images/but_india_inactive.jpg");
 top.topFrame.document.getElementById('toonplaats').setAttribute("src","images/but_toonplaats_inactive.jpg");
}