//=====================================================================
//  Pre-load menu images
//=====================================================================
var img1 = new Image();
var img2 = new Image();
var img3 = new Image();
var img4 = new Image();
var img5 = new Image();
var img6 = new Image();

img1.src = 'images/home_h.jpg';
img2.src = 'images/rep_h.jpg';
img3.src = 'images/ben_h.jpg';
img4.src = 'images/reg_h.jpg';
img5.src = 'images/abt_h.jpg';
img6.src = 'images/cnt_h.jpg';

function roll(img_name, img_src) {
//    document[img_name].src = img_src;
    document.getElementById(img_name).src = img_src;
}