// PreLoader
 function showPreLoader(mode)
 {
    var pleft = (screen.availWidth  - 302) / 2;
    var ptop  = (screen.availHeight - 102) / 2;

    document.getElementById('preLoader').style.width  = 302;
    document.getElementById('preLoader').style.height = 102;

    document.getElementById('preLoader').style.left   = pleft;
    document.getElementById('preLoader').style.top    = ptop - 125;

    document.getElementById('preLoader').style.visibility = ( mode == 1 ) ? "visible" : "hidden";
 }