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('isopad');
showlayer('tyco');
showlayer('sjcu');
showlayer('ifma');
showlayer('pacadtext');
showlayer('isopadbig');
showlayer('tycobig');
showlayer('sjcubig');
showlayer('ifmabig');
showlayer('pacadbig');
showlayer('main');
}

function hideall() {
hidelayer('isopad');
hidelayer('tyco');
hidelayer('sjcu');
hidelayer('ifma');
hidelayer('pacadtext');
hidelayer('isopadbig');
hidelayer('tycobig');
hidelayer('sjcubig');
hidelayer('ifmabig');
hidelayer('pacadbig');
hidelayer('main');
}