function SideMenu(id) {
if (!document.getElementById || !document.getElementsByTagName)
return false;
this.SideMenu = document.getElementById(id);
this.subSideMenus = this.SideMenu.getElementsByTagName("div");
this.remember = false;
this.speed = 3;
this.markCurrent = false;
this.oneSmOnly = true;
}
SideMenu.prototype.init = function() {
var mainInstance = this;
for (var i = 0; i < this.subSideMenus.length; i++)
this.subSideMenus[i].getElementsByTagName("span")[0].onclick = function() {
mainInstance.toggleMenu(this.parentNode);
};
if (this.markCurrent) {
var links = this.SideMenu.getElementsByTagName("a");
for (var i = 0; i < links.length; i++)
if (links[i].href == document.location.href) {
links[i].className = "current";
break;
}
}
if (this.remember) {
var regex = new RegExp("SideMenu_" + encodeURIComponent(this.SideMenu.id) + "=([01]+)");
var match = regex.exec(document.cookie);
if (match) {
var states = match[1].split("");
for (var i = 0; i < states.length; i++)
this.subSideMenus[i].className = (states[i] == 0 ? "collapsed" : "");
}
}
};
SideMenu.prototype.toggleMenu = function(subSideMenu) {
if (subSideMenu.className == "collapsed")
this.expandMenu(subSideMenu);
else
this.collapseMenu(subSideMenu);
};
SideMenu.prototype.expandMenu = function(subSideMenu) {
var fullHeight = subSideMenu.getElementsByTagName("span")[0].offsetHeight;
var links = subSideMenu.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 = subSideMenu.offsetHeight;
var newHeight = curHeight + moveBy;
if (newHeight < fullHeight)
subSideMenu.style.height = newHeight + "px";
else {
clearInterval(intId);
subSideMenu.style.height = "";
subSideMenu.className = "";
mainInstance.memorize();
}
}, 30);
this.collapseOthers(subSideMenu);
};
SideMenu.prototype.collapseMenu = function(subSideMenu) {
var minHeight = subSideMenu.getElementsByTagName("span")[0].offsetHeight;
var moveBy = Math.round(this.speed * subSideMenu.getElementsByTagName("a").length);
var mainInstance = this;
var intId = setInterval(function() {
var curHeight = subSideMenu.offsetHeight;
var newHeight = curHeight - moveBy;
if (newHeight > minHeight)
subSideMenu.style.height = newHeight + "px";
else {
clearInterval(intId);
subSideMenu.style.height = "";
subSideMenu.className = "collapsed";
mainInstance.memorize();
}
}, 30);
};
SideMenu.prototype.collapseOthers = function(subSideMenu) {
if (this.oneSmOnly) {
for (var i = 0; i < this.subSideMenus.length; i++)
if (this.subSideMenus[i] != subSideMenu && this.subSideMenus[i].className != "collapsed")
this.collapseMenu(this.subSideMenus[i]);
}
};
SideMenu.prototype.expandAll = function() {
var oldOneSmOnly = this.oneSmOnly;
this.oneSmOnly = false;
for (var i = 0; i < this.subSideMenus.length; i++)
if (this.subSideMenus[i].className == "collapsed")
this.expandMenu(this.subSideMenus[i]);
this.oneSmOnly = oldOneSmOnly;
};
SideMenu.prototype.collapseAll = function() {
for (var i = 0; i < this.subSideMenus.length; i++)
if (this.subSideMenus[i].className != "collapsed")
this.collapseMenu(this.subSideMenus[i]);
};
SideMenu.prototype.memorize = function() {
if (this.remember) {
var states = new Array();
for (var i = 0; i < this.subSideMenus.length; i++)
states.push(this.subSideMenus[i].className == "collapsed" ? 0 : 1);
var d = new Date();
d.setTime(d.getTime() + (30 * 24 * 60 * 60 * 1000));
document.cookie = "SideMenu_" + encodeURIComponent(this.SideMenu.id) + "=" + states.join("") + "; expires=" + d.toGMTString() + "; path=/";
}
}