var ie4 = (document.all) ? true : false;
var ns4 = (document.layers) ? true : false;
var ns6 = (document.getElementById && !document.all) ? true : false;

function hidelayer(lay) {
if (ie4) {document.all[lay].style.visibility = "hidden";}
if (ns4) {document.layers[lay].visibility = "hide";}
if (ns6) {document.getElementById([lay]).style.visibility = "hidden";}

}
function showlayer(lay) {
if (ie4) {document.all[lay].style.visibility = "visible";}
if (ns4) {document.layers[lay].visibility = "show";}
if (ns6) {document.getElementById([lay]).style.visibility = "visible";}

}


function showall() {
showlayer('layer1');
showlayer('layer2');
showlayer('layer3');
showlayer('layer4');
showlayer('layer5');
showlayer('layer6');
showlayer('layer7');
showlayer('layer8');
showlayer('wintergard');
showlayer('uhcuinsert');
showlayer('postcard');
showlayer('pacadnews');
showlayer('pacadinsert');
showlayer('moviead');
showlayer('mousepad');
showlayer('main');
showlayer('brochure');
}

function hideall() {
hidelayer('layer1');
hidelayer('layer2');
hidelayer('layer3');
hidelayer('layer4');
hidelayer('layer5');
hidelayer('layer6');
hidelayer('layer7');
hidelayer('layer8');
hidelayer('wintergard');
hidelayer('uhcuinsert');
hidelayer('postcard');
hidelayer('pacadnews');
hidelayer('pacadinsert');
hidelayer('moviead');
hidelayer('mousepad');
hidelayer('main');
hidelayer('brochure');
}