if (document) 
{
image1on = new Image(); image1on.src = "images/overviewON.gif";
image1off = new Image(); image1off.src = "images/overview.gif";
image2on = new Image(); image2on.src = "images/learnerON.gif";
image2off = new Image(); image2off.src = "images/learner.gif";
image3on = new Image(); image3on.src = "images/adminON.gif";
image3off = new Image(); image3off.src = "images/admin.gif";
image4on = new Image(); image4on.src = "images/helpON.gif";
image4off = new Image(); image4off.src = "images/help.gif";
image7on = new Image(); image7on.src = "images/contactON.gif";
image7off = new Image(); image7off.src = "images/contact.gif";
image8on = new Image(); image8on.src = "images/loginON.gif";
image8off = new Image(); image8off.src = "images/login.gif";
image9on = new Image(); image9on.src = "images/home.gif";
image9off = new Image(); image9off.src = "images/homeON.gif";
}

function turnOn(imageName) 
{if (document) {document[imageName].src = eval(imageName + "on.src");}}
function turnOff(imageName) 
{if (document) {document[imageName].src = eval(imageName + "off.src");}}