var DDSPEED = 1;
var DDTIMER = 10;
var OFFSET = -2;
var ZINT = 200;
function ddMenu(id, d) {
	var h = document.getElementById(id + "-ddheader");
	var c = document.getElementById(id + "-ddcontent");
	clearInterval(c.timer);
	if (d == 1) {
		clearTimeout(h.timer);
		c.style.display = "block";
		if (c.maxh && c.maxh <= c.offsetHeight) {
			return;
		} else {
			if (!c.maxh) {
				c.style.left = (h.offsetWidth + OFFSET) + "px";
				c.style.height = "auto";
				c.maxh = c.offsetHeight;
				c.style.height = "0px";
			}
		}
		ZINT = ZINT + 1;
		c.style.zIndex = ZINT;
		
		c.timer = setInterval(function () {
			ddSlide(c, 1);
		}, DDTIMER);
	} else {
		h.timer = setTimeout(function () {
			ddCollapse(c);
		}, 50);
	}
}
function ddCollapse(c) {
	c.timer = setInterval(function () {
		ddSlide(c, -1);
	}, DDTIMER);
}
function cancelHide(id) {
	var h = document.getElementById(id + "-ddheader");
	var c = document.getElementById(id + "-ddcontent");
	clearTimeout(h.timer);
	clearInterval(c.timer);
	
	if (c.offsetHeight < c.maxh) {
		c.timer = setInterval(function () {
			ddSlide(c, 1);
		}, DDTIMER);
	}
}
function ddSlide(c, d) {
	var currh = c.offsetHeight;
	var dist;
	if (d == 1) {
		dist = Math.round((c.maxh - currh) / DDSPEED);
	} else {
		dist = Math.round(currh / DDSPEED);
	}
	if (dist <= 1 && d == 1) {
		dist = 1;
	}
	c.style.height = currh + (dist * d) + "px";
	c.style.opacity = currh / c.maxh;
	c.style.filter = "alpha(opacity=" + (currh * 100 / c.maxh) + ")";
	if (currh > (c.maxh - 2) && d == 1) {
		clearInterval(c.timer);
	} else {
		if (dist < 1 && d != 1) {
			clearInterval(c.timer);
			c.style.display = "none";
		}
	}
}

$(function(){
	// 如果上面的插件没有显示出ddcontent的话，使用该绑定让其显示
	if($.browser.mozilla){
		$("[id$='-ddheader']").mousemove(function(){
			var ddObj = $(this).next(); 
			setTimeout(function () {
				if(ddObj.css("display") != "none" && ddObj.css("opacity") == 0){
					ddObj.css("opacity", 1);
				}
			}, 500);
		});
	}
});