/* DOM objects */
function ID(id) 
{
	return document.getElementById(id);
}

function getNodesOf(obj, str) 
{
	if (str) var tags = str.toHash(); 
	var result = [], items = obj.childNodes;
	for (var i = 0, lim = items.length; i < lim; i++) 
	{
		var item = items[i];
		if (item.nodeType != 1) continue;
		if (!tags || tags[item.tagName]) result.push(item);
	}
	return result;
}

function getPositionOf(obj)
{
	var pos = {x: 0, y: 0};
	for (var p = obj; p; p = p.offsetParent)
	{
		pos.x += p.offsetLeft;
		pos.y += p.offsetTop;
	}
	return pos;
}

function makeVisible(obj)
{
	obj.style.visibility = "visible";
}
function makeHidden(obj)
{
	obj.style.visibility = "hidden";
}

/* Events */
function processEvent(obj, method)
{
	var args = [].splice.call(arguments,2);
	return function(event) {
		event = event || window.event;
		obj[method].apply(obj, [event].concat(args));
	};
}
function stopEvent(event)
{
	event = event || window.event;
	event.cancelBubble = true;
}

/* className editor */
function classNameOf(obj)
{
	var cne = classNameEditor;
	cne.value = obj.className;
	cne.obj = obj;
	return cne;
}

var classNameEditor = {
seek: function(str)
{
	var s = " ", spaced = s + this.value + s;
	return spaced.seek(s = str + s);
},
add: function(str)
{
	if (!this.value.seek(str)) 
		this.obj.className = this.value + " " + str;
},
remove: function(str)
{
	if (!this.value.seek(str)) return;
	var s = " ", spaced = s + this.value + s;
	var sample = new RegExp(s + str +s);
	this.obj.className = spaced.replace(sample, s).trim();
},
flip: function(str)
{
	var newValue = this.add(str);
	if (this.value == newValue) this.remove(str);
}
};

/* Prototypes */
String.prototype.seek = function(str)
{
	return (this.indexOf(str) > -1);
}

String.prototype.toHash = function(spacer)
{
	var s = spacer || " ", hash = {};
	var a = this.split(s), i = a.length;
	while (i-- > 0) hash[a[i]] = true;	
	return hash;
}
String.prototype.trim = function()
{
	return this.replace(/^\s+|\s+$/g,"");
}

Number.prototype.decline = function(word)
{
	var n = this + " ", p = word.split(/- |,/g);
	var pn = n.match(/([^1]|^)1 /) ? 1 : (n.match(/([^1]|^)[234] /) ? 2 : 3);
	return n + p[0] + p[pn];
}

/* Cookies */
var cookies = {
path: "/",
dates: {},
keep: function(name, period)
{
	if (period) {
		var date = new Date();
		date.setDate(date.getDate() + period);
		this.dates[name] = date.toGMTString();
	} else {
		this.dates[name] = null;
	}
},
get: function(name)
{
	var s = ";", cookies = s + document.cookie.toString().replace("; ", s);
	var pos = cookies.indexOf(s + name + "=");
	return (pos == -1) ? null : cookies.substr(pos + name.length + 2).split(s, 1)[0]
},
set: function(name, value)
{
	var date = this.dates[name];
	var expires = date ? ("expires=" + date + ";") : "";
	document.cookie = name + "=" + value + ";" + expires + "path=" + this.path;
},
remove: function(name)
{
	document.cookie = name + "=;expires=Thu, 01-Jan-1970 00:00:01 GMT;path=" + this.path;
}
}