var menu = new Array();
menu[0] = new Image();
menu[0].src = '/images/about1.png';
menu[1] = new Image();
menu[1].src = '/images/about2.png';
menu[2] = new Image();
menu[2].src = '/images/portfolio1.png';
menu[3] = new Image();
menu[3].src = '/images/portfolio2.png';
menu[4] = new Image();
menu[4].src = '/images/order1.png';
menu[5] = new Image();
menu[5].src = '/images/order2.png';

function overItem(image, id)
{
    var itm = document.getElementById(id);
    itm.src = menu[image].src;
}