var DDSPEED = 2;
var DDTIMER = 15;
var DDAUTOCLOSE = 50;

// main function to handle the mouse events //
function ddMenuDown(id, d) {
    var h = document.getElementById(id + '-ddheader');
    var c = document.getElementById(id + '-ddcontent');
    clearInterval(c.timer);
    if (d > 0) {
        clearTimeout(h.timer);
        h.className = 'hot';
        c.style.display = 'block';
        if (c.maxh && c.maxh <= c.offsetHeight) {
            return;
        }
        else if (!c.maxh) {
            c.style.height = 'auto';
            c.maxh = c.offsetHeight;
            // Adjust for padding and borders
            c.style.height = c.maxh + 'px';
            c.maxh -= (c.offsetHeight - c.maxh);
            c.currh = 0;
            c.style.height = '0px';
        }
        c.timer = setInterval(function() { ddSlideDown(c, 1) }, DDTIMER);
        c.style.zIndex = 201;
    } else {
        c.style.display = 'block';
        h.timer = setTimeout(function() { ddCollapseUp(c) }, DDAUTOCLOSE);
        h.className = '';
    }
}

function ddMenuRight(id, d) {
    var h = document.getElementById(id + '-ddheader');
    var c = document.getElementById(id + '-ddcontent');
    clearInterval(c.timer);
    if (d > 0) {
        clearTimeout(h.timer);
        h.className = 'hot';
        c.style.display = 'block';
        if (c.maxw && c.maxw <= c.offsetWidth) {
            return;
        }
        else if (!c.maxw) {
            c.style.width = 'auto';
            c.maxw = c.offsetWidth;
            // Adjust for padding and borders
            c.style.width = c.maxw + 'px';
            c.maxw -= (c.offsetWidth - c.maxw);
            c.currw = 0;
            c.style.width = '0px';
        }
        c.timer = setInterval(function() { ddSlideRight(c, 1) }, DDTIMER);
        c.style.zIndex = 201;
    } else {
        c.style.display = 'block';
        h.timer = setTimeout(function() { ddCollapseLeft(c) }, DDAUTOCLOSE);
        h.className = '';
    }
}

// collapse the menu //
function ddCollapseUp(c) {
    c.style.zIndex = 199;
    c.timer = setInterval(function() { ddSlideDown(c, -1) }, DDTIMER);
}

// collapse the menu //
function ddCollapseLeft(c) {
    c.style.zIndex = 199;
    c.timer = setInterval(function() { ddSlideRight(c, -1) }, DDTIMER);
}

// cancel the collapse if a user rolls over the dropdown //
function ddCancelCollapseUp(id) {
    var h = document.getElementById(id + '-ddheader');
    var c = document.getElementById(id + '-ddcontent');
    h.className = 'hot';
    clearTimeout(h.timer);
    clearInterval(c.timer);
    if (c.maxh && c.offsetHeight < c.maxh) {
        c.zIndex = 201;
        c.timer = setInterval(function() { ddSlideDown(c, 1) }, DDTIMER);
    }
}

function ddCancelCollapseLeft(id) {
    var h = document.getElementById(id + '-ddheader');
    var c = document.getElementById(id + '-ddcontent');
    h.className = 'hot';
    clearTimeout(h.timer);
    clearInterval(c.timer);
    if (c.maxw && c.offsetWidth < c.maxw) {
        c.zIndex = 201;
        c.timer = setInterval(function() { ddSlideRight(c, 1) }, DDTIMER);
    }
}

// incrementally expand/contract the dropdown and change the opacity //
function ddSlideDown(c, d) {
    var dist;
    if (d > 0) {
        dist = (Math.round((c.maxh - c.currh) / DDSPEED));
    } else {
        dist = (Math.round(c.currh / DDSPEED));
    }

    c.currh = c.currh + (dist * d);
    c.style.height = c.currh + 'px';

    if (d > 0 && (c.maxh - c.currh) <= 1) {
        clearInterval(c.timer);
        c.currh = c.maxh;
        c.style.height = c.maxh + 'px';
    }
    if (d < 0 && c.currh <= 1) {
        clearInterval(c.timer);
        c.currh = 0;
        c.style.height = '0px';
        c.style.display = 'none';
    }
}

function ddSlideRight(c, d) {
    var dist;
    if (d > 0) {
        dist = (Math.round((c.maxw - c.currw) / DDSPEED));
    } else {
        dist = (Math.round(c.currw / DDSPEED));
    }

    c.currw = c.currw + (dist * d);
    c.style.width = c.currw + 'px';

    if (d > 0 && (c.maxw - c.currw) <= 1) {
        clearInterval(c.timer);
        c.currw = c.maxw;
        c.style.width = c.maxw + 'px';
    }
    if (d < 0 && c.currw <= 1) {
        clearInterval(c.timer);
        c.currw = 0;
        c.style.width = '0px';
        c.style.display = 'none';
    }

}