$(document).ready(function() {
    equalHeight($("[class^=col]"));
    var $scrollingDiv = $("#gbland");

    $(window).scroll(function() {
        if ($(window).scrollTop() - 400 > 0) {
            $scrollingDiv.stop().animate({ "marginTop": ($(window).scrollTop() - 400) + "px" }, "slow");
        } else {
            $scrollingDiv.stop().animate({ "marginTop": "0px" }, "slow");
        }
    });

});


function equalHeight(group) {
	tallest = 0;
	group.each(function() {
		thisHeight = $(this).height();
		if (thisHeight > tallest) {
			tallest = thisHeight;
		}
	});
	group.height(tallest);
}