var revert = new Array();
var names = new Array('logo','home','our_services','about_us','help_and_support');

// Preload the images
if (document.images) {
    var hovered = new Array();
    for(i=0; i < names.length; i++) {
        hovered[i] = new Image();
        hovered[i].src = "images/" + names[i] + "2.png";
    }
}

function mouseOver(num) {
    if(document.images) {
        revert[num] = document.images[names[num]].src;
        document.images[names[num]].src = hovered[num].src;
    }
}

function mouseOut(num) {
    if(document.images) document.images[names[num]].src = revert[num];
}