$(document).ready(function() {
    posBackgroundImage();
});

$(window).resize(function() {
    posBackgroundImage();
});

function posBackgroundImage() {
    var posLeftOffset = $(".content").offset().left;
    var backgroundWidth = $(window).width() - posLeftOffset;
    if (backgroundWidth < $(".content").width()) {
        backgroundWidth = $(".content").width();
    }
    $(".container .bg_image:first").css({ left: posLeftOffset, padding: "56px 0 0 0", width: backgroundWidth });
}