function resize_background(bg_locator, bg_width, min_window_width) {
        var background = $(bg_locator);
        var window_width = $(window).width();
        if (jQuery.browser.safari) {
            /* its -15 in safari osx and -16 in chrome */
            window_width -= 16;
        }
        if (jQuery.browser.msie) {
            window_width -= 1;
        }

        if (window_width > min_window_width) {
            background.css("width", window_width + "px");
            background.css("margin-left", (-window_width / 2) + "px");
            background.css("background-position", ((window_width - bg_width) / 2) + "px 0px");
        }
    }

    function resize_contestback() {
        resize_background(".contestback", 1500, 970);
    }