var revert = new Array();
var inames = new Array('youth', 'university', 'business', 'adults');

// Preload
if (document.images) {
    var flipped = new Array();
    for(i=0; i< inames.length; i++) {
        flipped[i] = new Image();
        flipped[i].src = "templates/template-images/home/"+inames[i]+"1.jpg";
    }
}

function over(num) {
    if(document.images) {
        revert[num] = document.images[inames[num]].src;
        document.images[inames[num]].src = flipped[num].src;
    }
}
function out(num) {
    if(document.images) document.images[inames[num]].src = revert[num];
}