function SDMenu(id) {
	if (!document.getElementById || !document.getElementsByTagName)
		return false;
	this.menu = document.getElementById(id);
	this.submenus = this.menu.getElementsByTagName("div");
	this.remember = true;
	this.speed = 3;
	this.markCurrent = true;
	this.oneSmOnly = true;
	//this.moving = false; //control onmouseover
}
SDMenu.prototype.init = function() {
	var mainInstance = this;
	var b_find = false;
	var tmpHPage = document.location.href.split( "/" ); 
	var thisHPage = tmpHPage[ tmpHPage.length-1 ]; 

	for (var i = 0; i < this.submenus.length; i++)  {
			this.submenus[i].getElementsByTagName("span")[0].onclick = function() {
				mainInstance.toggleMenu(this.parentNode);
			};
	}
	if (this.remember) {
		var regex = new RegExp("sdmenu_" + encodeURIComponent(this.menu.id) + "=([01]+)");
		var match = regex.exec(document.cookie);
		if (match) {
			var states = match[1].split("");
			for (var i = 0; i < states.length; i++)
				if (this.submenus[i].parentNode.parentNode.parentNode.tagName == "DIV") 					
					this.submenus[i].className = (states[i] == 0 ? "collapsed" : "opened");
				else
					this.submenus[i].className = (states[i] == 0 ? "collapsed" : "");
		}
	}
	
	if (this.markCurrent) {		
		var links = this.menu.getElementsByTagName("a");
		for (var i = 0; i < links.length; i++)
			if (links[i].href == document.location.href) {
				b_find = true;
				mainInstance.expandMenu(links[i].parentNode);
				if (links[i].parentNode.parentNode.id == "my_menu") {
					//当前1级菜单
					links[i].className = links[i].className + " current";		
				}else{
					//当前2级菜单
					mainInstance.expandMenu(links[i].parentNode.parentNode);
					links[i].className = links[i].className + " current";
				}
				break;
			}
		if  (!b_find ) {
			//mainInstance.collapseAll();
			var spans = this.menu.getElementsByTagName("span");
			for (var i = 0; i < spans.length; i++)
				if (spans[i].title == thisHPage){
					spans[i].parentNode.className = "collapsed";			
					spans[i].className = "bold current";
					mainInstance.collapseOthers(this.submenus[i]);
				}
		}			
			
	}
	/*
	if (this.remember) {
		var regex = new RegExp("sdmenu_" + encodeURIComponent(this.menu.id) + "=([01]+)");
		var match = regex.exec(document.cookie);
		if (match) {
			var states = match[1].split("");
			for (var i = 0; i < states.length; i++)
				this.submenus[i].className = (states[i] == 0 ? "collapsed" : "");
		}
	}
	*/	
};

SDMenu.prototype.toggleMenu = function(submenu) {
	//if ((submenu.className == "collapsed")   && (!this.moving)) {
	var stitle = submenu.getElementsByTagName("span")[0].title;	
	if (stitle != "") 
		document.location.href = submenu.getElementsByTagName("span")[0].title;		
	if (submenu.className == "collapsed")
		//this.moving = true;	
		this.expandMenu(submenu);
	else
		this.collapseMenu(submenu);	
};
SDMenu.prototype.expandMenu = function(submenu) {
	var fullHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
	var links = submenu.getElementsByTagName("a");
	for (var i = 0; i < links.length; i++)
		fullHeight += links[i].offsetHeight;
	var moveBy = Math.round(this.speed * links.length);
	
	var mainInstance = this;
	var intId = setInterval(function() {
		var curHeight = submenu.offsetHeight;
		var newHeight = curHeight + moveBy;
		if (newHeight < fullHeight) {
			submenu.style.height = newHeight + "px";
		} else {
			//mainInstance.moving = false;
			clearInterval(intId);
			submenu.style.height = "";
			if (submenu.parentNode.parentNode.parentNode.tagName == "DIV") {
				submenu.className = "opened";
				submenu.getElementsByTagName("span")[0].className = "current";
			}else{
				submenu.className = "";
				submenu.getElementsByTagName("span")[0].className = "bold current";
			}
			mainInstance.memorize();
			mainInstance.collapseOthers(submenu);
		}
	}, 30);
};
SDMenu.prototype.collapseMenu = function(submenu) {
	var minHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
	var moveBy = Math.round(this.speed * submenu.getElementsByTagName("a").length);
	var mainInstance = this;
	var intId = setInterval(function() {
		var curHeight = submenu.offsetHeight;
		var newHeight = curHeight - moveBy;
		if (newHeight > minHeight)
			submenu.style.height = newHeight + "px";
		else {
			clearInterval(intId);
			submenu.style.height = "";
			if (submenu.parentNode.parentNode.parentNode.tagName == "DIV") {
				submenu.getElementsByTagName("span")[0].className = "";
			} else {
				submenu.getElementsByTagName("span")[0].className = "bold";
			}			
			submenu.className = "collapsed";
			mainInstance.memorize();
		}
	}, 30);
};
SDMenu.prototype.collapseOthers = function(submenu) {
	if (this.oneSmOnly) {
		for (var i = 0; i < this.submenus.length; i++){
			if (this.submenus[i] != submenu && this.submenus[i].className != "collapsed") {				
				if (submenu.parentNode.parentNode.parentNode.tagName == "TD" && this.submenus[i].parentNode.parentNode.parentNode.tagName == "TD") 
					this.collapseMenu(this.submenus[i]);
				if (submenu.parentNode.parentNode.parentNode.tagName == "DIV" && this.submenus[i].parentNode.parentNode.parentNode.tagName == "DIV")
					this.collapseMenu(this.submenus[i]);
				if (submenu.parentNode.parentNode.parentNode.tagName == "DIV" && submenu.parentNode != this.submenus[i] && this.submenus[i].parentNode.parentNode.parentNode.tagName == "TD")
					this.collapseMenu(this.submenus[i]);
			}
		}
	}
};
SDMenu.prototype.expandAll = function() {
	var oldOneSmOnly = this.oneSmOnly;
	this.oneSmOnly = false;
	for (var i = 0; i < this.submenus.length; i++)
		if (this.submenus[i].className == "collapsed")
			this.expandMenu(this.submenus[i]);
	this.oneSmOnly = oldOneSmOnly;
};
SDMenu.prototype.collapseAll = function() {
	for (var i = 0; i < this.submenus.length; i++)
		if (this.submenus[i].className != "collapsed" && this.submenus[i].getElementsByTagName("a").length>0)
			this.collapseMenu(this.submenus[i]);
};
SDMenu.prototype.memorize = function() {
	if (this.remember) {
		var states = new Array();
		for (var i = 0; i < this.submenus.length; i++)
			states.push(this.submenus[i].className == "collapsed" ? 0 : 1);
		var d = new Date();
		d.setTime(d.getTime() + (30 * 24 * 60 * 60 * 1000));
		document.cookie = "sdmenu_" + encodeURIComponent(this.menu.id) + "=" + states.join("") + "; expires=" + d.toGMTString() + "; path=/";
	}
};
/* returns an array of elements of a given tag and classname */  
function getElementsByTagClass(tag, classname){  
	var allElements = document.getElementsByTagName(tag);  
	var classed = new Array();  
	var i, j, c;  
   
	for (i=0, j=0; i < allElements.length; i++){  
		c = " " + allElements[i].className + " ";  
		if (c.indexOf(" " + classname + " ") != -1){  
			classed[j++] = allElements[i];  
		}  
	}  
  return classed;  
}