/*
* 
* credits to http://css-tricks.com/long-dropdowns-solution/
*
*/

var maxheight = 400;

$(function(){

    $(".dropdown > li").hover(function() {
    
         var $container = $(this),
             $list = $container.find("ul"),
             $anchor = $container.find("a"),
             height = $list.height() * 1.1,       // make sure there is enough room at the bottom
             multiplier = height / maxheight;     // needs to move faster if list is taller
        
        // need to save height here so it can revert on mouseout            
        $container.data("origheight", $container.height());
        
        // so it can retain it's rollover color all the while the dropdown is open
        $anchor.addclass("hover");
        
        // make sure dropdown appears directly below parent list item    
        $list
            .show()
            .css({
                paddingtop: $container.data("origheight")
            });
        
        // don't do any animation if list shorter than max
        if (multiplier > 1) {
            $container
                .css({
                    height: maxheight,
                    overflow: "hidden"
                })
                .mousemove(function(e) {
                    var offset = $container.offset();
                    var relativey = ((e.pagey - offset.top) * multiplier) - ($container.data("origheight") * multiplier);
                    if (relativey > $container.data("origheight")) {
                        $list.css("top", -relativey + $container.data("origheight"));
                    };
                });
        }
        
    }, function() {
    
        var $el = $(this);
        
        // put things back to normal
        $el
            .height($(this).data("origheight"))
            .find("ul")
            .css({ top: 0 })
            .hide()
            .end()
            .find("a")
            .removeclass("hover");
    
    });  
    
});