$(document).ready(function(){
    if($('.main_table_sticky_header').length > 0)
    {
        var scroll_pos_test = $('.main_table_sticky_header').offset();
        $(window).scroll(function() {
            var y_scroll_pos = window.pageYOffset;

            $('.main_table_sticky_header').css('z-index','120');
            $('.main_table_sticky_header').css('backgroung-color','#F5F5F2');
            //// set to whatever you want it to be
    //        alert($('.main_table_sticky_header').css('position'));
            if(y_scroll_pos > scroll_pos_test.top) {
                if($('.main_table_sticky_header').css('position') == 'static')
                {

                    $('.main_table_sticky_header').css('position','fixed');
                    $('.main_table_sticky_header').css('left', scroll_pos_test.left);
                    $('.main_table_sticky_header').css('top', '0');
                }
            }
            else
            {
                if($('.main_table_sticky_header').css('position') == 'fixed')
                {
                    $('.main_table_sticky_header').css('position','static');
                    $('.main_table_sticky_header').css('left', '0');
                }
            }
        });
    }
});