/* bottom right floating image */

var HELP_Y_LOC = null;
var HELP_BOTTOM = 0;

function calculate_help_y_loc() {
    var help_text = $("#floating_box");
    HELP_Y_LOC = $(window).innerHeight() - HELP_BOTTOM - help_text.outerHeight();
    $("#floating_box").css("top", HELP_Y_LOC);
}

function animate_help_on_scroll() {
   var offset = (HELP_Y_LOC + $(document).scrollTop()) + "px";
   $("#floating_box").animate({"top": offset}, {duration: 500, queue: false});
}