var preload;

function loadImages(){

    if(document.images){

        preload = false;

        images = new Array();

        images['b1_off'] = new Image();
        images['b1_off'].src = "/images/about_p.gif";

        images['b1_on'] = new Image();
        images['b1_on'].src =  "/images/about_a.gif";

        images['b2_off'] = new Image();
        images['b2_off'].src = "/images/dispatcher_p.gif";

        images['b2_on'] = new Image();
        images['b2_on'].src =  "/images/dispatcher_a.gif";

        images['b3_off'] = new Image();
        images['b3_off'].src = "/images/news_p.gif";

        images['b3_on'] = new Image();
        images['b3_on'].src =  "/images/news_a.gif";

        images['b4_off'] = new Image();
        images['b4_off'].src = "/images/release_p.gif";

        images['b4_on'] = new Image();
        images['b4_on'].src =  "/images/release_a.gif";

        images['b5_off'] = new Image();
        images['b5_off'].src = "/images/driver_p.gif";

        images['b5_on'] = new Image();
        images['b5_on'].src =  "/images/driver_a.gif";

        images['b6_off'] = new Image();
        images['b6_off'].src = "/images/passenger_p.gif";

        images['b6_on'] = new Image();
        images['b6_on'].src =  "/images/passenger_a.gif";

        images['b7_off'] = new Image();
        images['b7_off'].src = "/images/contest_p.gif";

        images['b7_on'] = new Image();
        images['b7_on'].src =  "/images/contest_a.gif";

        images['b8_off'] = new Image();
        images['b8_off'].src = "/images/forum_p.gif";

        images['b8_on'] = new Image();
        images['b8_on'].src =  "/images/forum_a.gif";

        images['b9_off'] = new Image();
        images['b9_off'].src = "/images/home_p.gif";

        images['b9_on'] = new Image();
        images['b9_on'].src =  "/images/home_a.gif";

        images['b10_off'] = new Image();
        images['b10_off'].src = "/images/doc_p.gif";

        images['b10_on'] = new Image();
        images['b10_on'].src =  "/images/doc_p.gif";
        preload=true;
    }

}

loadImages();

function swapImages(obj, name){

    if (document.images && preload==true) {
        document.images[obj].src = images[name].src;
    }

}