$(document).ready(function () {
    var date = new Date();
    if (((date.getMonth() == 2 && date.getDate() <= 15) || (date.getMonth() < 2)) || ((date.getMonth() == 8 && date.getDate() >= 15) || (date.getMonth() > 8)))
        $("#bcPage").css("background-image", "url(/templates/main/images/bcHeaderWinter.jpg)");
});