function Imges()
{
if(document.images)
{
Toindexon=new Image();
Toindexon.src="../common_images/index_on.gif";
Contenton=new Image();
Contenton.src="../common_images/content_on.gif";

Toindexoff=new Image();
Toindexoff.src="../common_images/index.gif";
Contentoff=new Image();
Contentoff.src="../common_images/content.gif";
}
}

function on(imgName)
{
ONImage=eval(imgName+"on.src")
document[imgName].src=ONImage
}

function off(imgName)
{
OFFImage=eval(imgName+"off.src")
document[imgName].src=OFFImage
}

function Backtop()
{
if(navigator.appName=="Microsoft Internet Explorer")
{
window.location.href="../../indexIE.html"
}
else
{
window.location.href="../../indexNN.html"
}
}