/* XmlHttpRequest library */
/* Version 0.9.2.2, 6 May 2005, Adamv.com */

function Request() {
	this.Get = Request_get
	this.GetNoCache = Request_get_no_cache
	this.CachedGet = Request_cached_get
	this.FromCache = Request_from_cache
	
	this.Use = function(){return this._get!=null}
	this.Cancel = function(){if (this._get) this._get.abort();}
	this._cache = new Object();
	
	this._get = _getXmlHttp();
	if (this._get == undefined) return;
	
	ReadyState = {
		Uninitialized: 0,
		Loading: 1,
		Loaded:2,
		Interactive:3,
		Complete: 4
	}
		
	HttpStatus = {
		OK: 200,
		NotFound: 404
	}
		
	//΄΄½¨ XMLHttp ΆΤΟσ;
	function _getXmlHttp()
	{
		try{
			return new XMLHttpRequest();
		}
		catch(e){
			try{
				return new ActiveXObject("Msxml2.XMLHTTP");
			}
			catch(e){
				try{
					return new ActiveXObject("Microsoft.XMLHTTP");
				}
				catch(e){

				}			
			}
		}
	}

	function CachedResponse(response) {
		this.readyState = ReadyState.Complete
		this.status = HttpStatus.OK
		this.responseText = response
	}

	function Request_from_cache(url, f_change) {
		var result = this._cache[url];
		
		if (result != null) {
			var response = new CachedResponse(result)
			f_change(response)
			return true
		}
		else
			return false
	}

	function Request_cached_get(url, f_change) {
		if (!this.FromCache(url, f_change)){
			var request = this
			this.Get(url,
				/* Cache results if request completed */
				function(x){
					if ((x.readyState==ReadyState.Complete)&&(x.status==HttpStatus.OK))
					{request._cache[url]=x.responseText}
					f_change(x)
				},
				"GET")
		}
	}

	function Request_get(url, f_change, method) {
		if (!this._get) return;
		
		if (method == null) method="GET"
		if (this._get.readyState != ReadyState.Uninitialized)
			this._get.abort() 
		
		this._get.open(method, url, true);
		
		if (f_change != null) {
			var _get = this._get;
			this._get.onreadystatechange = function(){f_change(_get);}
		}
		this._get.send(null);
	}

	function Request_get_no_cache(url, f_change, method){
		var sep = (-1 < url.indexOf("?")) ? "&" : "?"	
		var newurl = url + sep + "__=" + encodeURIComponent((new Date()).toString());
		return this.Get(newurl, f_change, method);
	}	
}