function SetBackground(contentId, vOffset)
{
    var $contentId = $("#" + contentId);
    var $child = $("#" + contentId + " :first-child");
    var height = $contentId.offset().top + $child.height();
    var marginTop = parseInt($contentId.css("margin-top"));
    //var left = $("#container").offset().left - 70;
    var left = (($(window).width() - $("#container").outerWidth()) / 2) - 70;
    
    if (isNaN(marginTop))
        marginTop = 0;

    height = height + 50 + vOffset + marginTop;

    $("#bg-img").css("top", "0");
    $("#bg-img").height(height + "px");
    $("#bg-img").width("1024px");
    $("#bg-img").css("left", left + "px");
}