$(document).ready(function(){
	$.preloadImages("images/icons/atypes/nav_1_roll.jpg", 
					"images/icons/atypes/nav_2_roll.jpg", 
					"images/icons/atypes/nav_3_roll.jpg",
					"images/icons/atypes/nav_4_roll.jpg");
	
    $("#atype_nav li ul").css("display", "none");
	
    $("#atype_nav li").hover(
        function(){ $("ul", this).fadeIn("medium"); }, 
        function() { $("ul", this).hide(0); } 
    );
    if (document.all) {
        $("#atype_nav li").hoverClass ("sfHover");
    }
});

$.fn.hoverClass = function(c) {
    return this.each(function(){
        $(this).hover( 
            function() { $(this).addClass(c);  },
            function() { $(this).removeClass(c); }
        );
    });
};    


function doRoll(e, over){
	var i = $(e[0]).children("img");
	i = i[0];
	var src = (over) ? $(i).attr("id")+"_roll" : $(i).attr("id");
	if($(i).attr("className") != "selected") $(i).attr("src", "images/icons/atypes/"+src+".jpg");
}