function preloadMedia()
{
    var img1  = new Image();
    var img2  = new Image();
    var img3  = new Image();
    var img4  = new Image();
    var img5  = new Image();
    var img6  = new Image();
    var img7  = new Image();
    var img8  = new Image();
    var img9  = new Image();
    var img10 = new Image();
    var img11 = new Image();
    var img12 = new Image();
    var img13 = new Image();
    var img14 = new Image();
    var img15 = new Image();
    var img16 = new Image();
    var img17 = new Image();
    var img18 = new Image();
    var img19 = new Image();
    var img20 = new Image();
    var img21 = new Image();
    var img22 = new Image();
    var img23 = new Image();

    // small circle
    img1.src  = SGL_JS_WEBROOT + '/images/Image/icon_small_personnel_over.gif';
    img2.src  = SGL_JS_WEBROOT + '/images/Image/icon_small_vihicle_over.gif';
    img3.src  = SGL_JS_WEBROOT + '/images/Image/icon_small_aircraft_over.gif';
    img4.src  = SGL_JS_WEBROOT + '/images/Image/icon_small_locations_over.gif';
    img5.src  = SGL_JS_WEBROOT + '/images/Image/icon_small_tracking_over.gif';
    img6.src  = SGL_JS_WEBROOT + '/images/Image/icon_c4i_over.gif';

    // about flow
    img7.src  = SGL_JS_WEBROOT + '/images/Image/icon_flow_step_01_over.gif';
    img8.src  = SGL_JS_WEBROOT + '/images/Image/icon_flow_step_02_over.gif';
    img9.src  = SGL_JS_WEBROOT + '/images/Image/icon_flow_step_03_over.gif';
    img10.src = SGL_JS_WEBROOT + '/images/Image/icon_flow_step_04_over.gif';
    img11.src = SGL_JS_WEBROOT + '/images/Image/icon_flow_step_05_over.gif';
    img12.src = SGL_JS_WEBROOT + '/images/Image/icon_flow_step_06_over.gif';

    // icons
    img13.src = SGL_JS_WEBROOT + '/images/Image/icon_tracking_over.gif';
    img14.src = SGL_JS_WEBROOT + '/images/Image/icon_consultancy_over.gif';
    img15.src = SGL_JS_WEBROOT + '/images/Image/icon_crisis_over.gif';
    img16.src = SGL_JS_WEBROOT + '/images/Image/icon_monitoring_over.gif';
    img17.src = SGL_JS_WEBROOT + '/images/Image/icon_command_over.gif';
    img18.src = SGL_JS_WEBROOT + '/images/Image/icon_customer-support_over.gif';
    img19.src = SGL_JS_WEBROOT + '/images/Image/icon_training_over.gif';
    img20.src = SGL_JS_WEBROOT + '/images/Image/icon_aircraft_over.gif';
    img21.src = SGL_JS_WEBROOT + '/images/Image/icon_locations_over.gif';
    img22.src = SGL_JS_WEBROOT + '/images/Image/icon_personnel_over.gif';
    img23.src = SGL_JS_WEBROOT + '/images/Image/icon_vihicle_over.gif';
}
preloadMedia();