var browser_type=navigator.appName
var browser_version=parseInt(navigator.appVersion)
if (browser_type=="Netscape"&&browser_version==4) {layer = "document.layers['L'+menu]" ; var b = "n4";}
else if (browser_type=="Netscape"&&browser_version>=5) {layer = "document.getElementById(['L'+menu]).style"; var b = "n5";}
else if (browser_type=="Microsoft Internet Explorer"&&browser_version>=4) {layer =  "document.all['L'+menu].style"; var b = "ie";}
else {var b = 0;}

function hide(x)
{
if(b=="n4") {document.layers[x].visibility="hide";}
if(b=="n5") { document.getElementById(x).style.visibility = "hidden";}
if(b=="ie"){document.all[x].style.visibility="hidden";}
}

function show(x)
{

hideall();

if(b=="n4") {document.layers[x].visibility="show";}
if(b=="n5") { document.getElementById(x).style.visibility = "visible";}
if(b=="ie"){document.all[x].style.visibility="visible";}

}
function hideall()
{
hide ('m1');
hide ('m2');
hide ('m3');
//hide ('m4');
hide ('m5');
hide ('m6');
hide ('m7');

}