browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);

if (browserName == "Netscape" && browserVer >= 3)
{ init = "net"; }
else { init = "ie"; }



if ((init == "net")||((init == "ie")&&(browserVer >= 4)))
{

image1on = new Image;
image1on.src = "/image/menu11.gif";
image1off = new Image;
image1off.src = "/image/menu1.gif";

image2on = new Image;
image2on.src = "/image/menu21.gif";
image2off = new Image;
image2off.src = "/image/menu2.gif";

image3on = new Image;
image3on.src = "/image/menu31.gif";
image3off = new Image;
image3off.src = "/image/menu3.gif";

image4on = new Image;
image4on.src = "/image/menu41.gif";
image4off = new Image;
image4off.src = "/image/menu4.gif";

image5on = new Image;
image5on.src = "/image/menu51.gif";
image5off = new Image;
image5off.src = "/image/menu5.gif";


}
function img_on(imgName)
{
if (((init == "net")&&(browserVer >=3))||((init == "ie")&&(browserVer >= 4)))
{
imgOn = eval(imgName + "on.src");
document[imgName].src = imgOn;
}
}
function img_off(imgName)
{
if (((init == "net")&&(browserVer >=3))||((init == "ie")&&(browserVer >= 4)))
{
imgOff = eval(imgName + "off.src");
document[imgName].src = imgOff;
}
}


// show-hide layer
ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false

function layer_show(id) {
	if (ns4) document.layers[id].visibility = "show"
	else if (ie4) document.all[id].style.visibility = "visible"
}

function layer_hidden(id) {
	if (ns4) document.layers[id].visibility = "hide"
	else if (ie4) document.all[id].style.visibility = "hidden"
}