function mouseOver3()
{
document.event3.src ="images/menu/home.png"
} 
function mouseOut3()
{
document.event3.src ="images/menu/home_grey.png"
}

function mouseOver4()
{
document.event4.src ="images/menu/portfolio.png"
}
function mouseOut4()
{
document.event4.src ="images/menu/portfolio_grey.png"
}

function mouseOver5()
{
document.event5.src ="images/menu/contact.png"
}
function mouseOut5()
{
document.event5.src ="images/menu/contact_grey.png"
}