function productsmouseOver()
{
document.getElementById("products").src ="/ch/white-bg.jpg";
}
function productsmouseOut()
{
document.getElementById("products").src ="/ch/images/products.jpg";
}

function learningcentermouseOver()
{
document.getElementById("learningcenter").src ="/ch/white-bg.jpg";
}
function learningcentermouseOut()
{
document.getElementById("learningcenter").src ="/ch/images/Learningcenter.jpg";
}

function promegapointsmouseOver()
{
document.getElementById("promegapoints").src ="/ch/white-bg.jpg";
}
function promegapointsmouseOut()
{
document.getElementById("promegapoints").src ="/ch/images/promegapoints.jpg";
}

function bestbuymouseOver()
{
document.getElementById("bestbuy").src ="/ch/white-bg.jpg";
}
function bestbuymouseOut()
{
document.getElementById("bestbuy").src ="/ch/images/bestbuy.jpg";
}

function instrumentsmouseOver()
{
document.getElementById("instruments").src ="/ch/white-bg.jpg";
}
function instrumentsmouseOut()
{
document.getElementById("instruments").src ="/ch/images/instruments.jpg";
}

function nonpromegamouseOver()
{
document.getElementById("nonpromega").src ="/ch/white-bg.jpg";
}
function nonpromegamouseOut()
{
document.getElementById("nonpromega").src ="/ch/images/nonpromega.jpg";
}

function infocentermouseOver()
{
document.getElementById("infocenter").src ="/ch/white-bg.jpg";
}
function infocentermouseOut()
{
document.getElementById("infocenter").src ="/ch/images/infocenter.jpg";
}

function pexmouseOver()
{
document.getElementById("pex").src ="/ch/white-bg.jpg";
}
function pexmouseOut()
{
document.getElementById("pex").src ="/ch/images/pex.jpg";
}

function contactusmouseOver()
{
document.getElementById("contactus").src ="/ch/white-bg.jpg";
}
function contactusmouseOut()
{
document.getElementById("contactus").src ="/ch/images/contactus.jpg";
}