');
document.close();
used_arr[used_index] = random_num;
used_index++;
}
else randomImage();
}
function get_random(){
return Math.ceil(Math.random() * 50);
}
function is_used(r_num) {
// This function ensures that an image is not displayed twice.
for (m = 0; m < used_arr.length; m++) {
if (r_num == used_arr[m]) return true;
}
return false;
}
/* function: shift_img()
* This function will automatically load a new material image in place
* on one of the existing material images every few seconds.
* I commented out the logic because it forces the browser to download
* the new images (and slow the connection) since they were not preloaded
* into the cache.
*/
var n = 0;
function shift_img() {
if (used_arr.length >= 25) {
used_arr = new Array();
}
if (n >= used_index) n = 0;
var random_num = get_random();
if (!is_used(random_num)) {
document['mat' + n].src = diff_path + 'images/mat' + random_num + '.jpg';
used_arr[used_arr.length] = random_num
n++;
}
setTimeout('shift_img()', 1000); // 1000 = 1 second
}
/*
* Navigation bar module
*/
function draw_navbar() {
document.open();
document.write('' +
'
| ' +
'
 | ' +
'
| ' + ' | ' + '
