if (document.images)
    {   var homeOff = new Image()
        homeOff.src = "images/home.jpg"
        var homeOn = new Image()
        homeOn.src = "images/home_over.jpg"

        var computersOff = new Image()
        computersOff.src = "images/computers.jpg"
        var computersOn = new Image()
        computersOn.src = "images/computers_over.jpg"
       
        var contactOff = new Image()
        contactOff.src = "images/contact.jpg"
        var contactOn = new Image()
        contactOn.src = "images/contact_over.jpg"
		
		var emailOff = new Image()
        emailOff.src = "images/email.jpg"
        var emailOn = new Image()
        emailOn.src = "images/email_over.jpg"
		
}		
function inact(imgName)
{
	if(document.images)
		document[imgName].src = eval(imgName+'Off.src')
}

function act(imgName)
{
	if(document.images)
		document[imgName].src = eval(imgName+'On.src')
}