/*

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css sprites 2
nav behaviour

http://www.alistapart.com/articles/sprites2
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*/

function generateSprites(parent, selectedPrefix, setActive, hoverSpeed, style) {
    // throw the parent object's class into a variable
    var parentClass = $(parent).attr("class");

    // start a loop that cycles through each of the li elements inside the parent element
    $(parent).children("li").each(function () {
        // create a few variables that we'll need during this function:
        // myClass = the class of the object we're currently inspecting
        // current = what the selected class should look like for the parent of the object we're currently inspecting
        var myClass = ($(this).attr("class"))
        var current = parent.substring(1) + " current-" + ($(this).attr("class"));

        // turn on nav events for element this loop identifies
        attachNavEvents(parent, myClass, setActive, hoverSpeed, style);

        // let's hide the CSS-defined background image, but only if this isn't the currently-selected item
        if (parentClass != current) {
            $(this).children("a").css({ backgroundImage: "none" });
        }

    });
}


function attachNavEvents(parent, myClass, setActive, hoverSpeed, style) {
    $(parent + " ." + myClass).mouseover(function () {
        // create pseudo-link
        $(this).append('<div class="nav-' + myClass + '"></div>');
        // either slide or fade, depending on the style value
        if (style == "slide") {
            // slide down the pseudo-link
            $("div.nav-" + myClass).css({ display: "none" }).slideDown(hoverSpeed);
        } else {
            // fade in the pseudo-link
            $("div.nav-" + myClass).css({ display: "none" }).fadeIn(hoverSpeed);
        }
    }).mouseout(function () {
        // either slide or fade, depending on the style value
        if (style == "slide") {
            // slide up & destroy pseudo-link
            $("div.nav-" + myClass).slideUp(hoverSpeed, function () {
                $(this).remove();
            });
        } else {
            // fade out & destroy pseudo-link
            $("div.nav-" + myClass).fadeOut(hoverSpeed, function () {
                $(this).remove();
            });
        }
    });


    // we only want to check the mousedown/up events if the CSS exists for :active states
    // if so, let's apply our selective filtering to undo the events above
    if (setActive) {
        $(parent + " ." + myClass).mousedown(function () {
            $("div.nav-" + myClass).attr("class", "nav-" + myClass + "-click");
        }).mouseup(function () {
            $("div.nav-" + myClass + "-click").attr("class", "nav-" + myClass);
        });
    }
}