$(document).ready(function() {
    //On Hover Over
    function megaHoverOver() {
        $(this).find(".sub-menu").stop().fadeTo('fast', 1).show(); //Find sub and fade it in
        (function($) {
            //Function to calculate total width of all ul's
            jQuery.fn.calcSubWidth = function() {
                rowWidth = 0;
                //Calculate row
                $(this).find("ul").each(function() { //for each ul...
                    rowWidth += $(this).width(); //Add each ul's width together
                });
            };
        })(jQuery);

        if ($(this).find(".row").length > 0) { //If row exists...
            var biggestRow = 0;
            $(this).find(".row").each(function() {	//for each row...
                $(this).calcSubWidth(); //Call function to calculate width of all ul's
                //Find biggest row
                if (rowWidth > biggestRow) {
                    biggestRow = rowWidth;
                }
            });
            $(this).find(".sub-menu").css({ 'width': biggestRow }); //Set width
            $(this).find(".row:last").css({ 'margin': '0' });  //Kill last row's margin
        } else { //If row does not exist...
            $(this).calcSubWidth();  //Call function to calculate width of all ul's
            $(this).find(".sub-menu").css({ 'width': rowWidth }); //Set Width
        }
    }
    //On Hover Out
    function megaHoverOut() {
        $(this).find(".sub-menu").stop().fadeTo('fast', 0, function() { //Fade to 0 opactiy
            $(this).hide();  //after fading, hide it
        });
    }

    var config = {
        sensitivity: 2, // number = sensitivity threshold (must be 1 or higher)    
        interval: 100, // number = milliseconds for onMouseOver polling interval    
        over: megaHoverOver, // function = onMouseOver callback (REQUIRED)    
        timeout: 500, // number = milliseconds delay before onMouseOut    
        out: megaHoverOut // function = onMouseOut callback (REQUIRED)    
    };
    $("ul#header-nav li .sub-menu").css({ 'opacity': '0' });
    $("ul#header-nav li").hoverIntent(config);
});