var clpStateChangeObjectArray = new Array(); // queue

function ClpStateChangeObject(url, stateChangeRequest) {
	this.stateChangeRequest = stateChangeRequest;
	this.url = url;
	this.clpDoIt=clpDoIt;
	this.clpHandleNextObject=clpHandleNextObject;
	this.clpInit = clpInit;
	this.changes = new Array();
	this.changesNew = new Array();
}
function clpInit() {
	try {
		// Firefox, Opera 8.0+, Safari
		this.stateChangeRequest = new XMLHttpRequest();
	} catch (e) {
		// Internet Explorer
		try {
			this.stateChangeRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				this.stateChangeRequest=new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {
				//alert("Your browser does not support AJAX!");
			}
		}
	}
	return this.stateChangeRequest;
}
function clpStripUrl(href) {
	href.match(/submitItemStateChange.'([^']+)'/);
	return RegExp.$1;
}
function clpHandleNextObject(self) {
	clpStateChangeObjectArray.shift(); // remove myself
	while (self.changes.length>0) {
		var oldLink = self.changes.shift();
		var newLink = self.changesNew.shift();
		var oldUrl = clpStripUrl(oldLink);
		var newUrl = clpStripUrl(newLink);
		var n = clpGetStateChangeObject(oldUrl);
		if (n) n.url=newUrl;
	}
	if (clpStateChangeObjectArray.length>0) {
		var newStateChangeObject = clpStateChangeObjectArray.shift();
		newStateChangeObject.clpDoIt();
	}
}
function clpDoIt() {
	if (!this.clpInit()) {
		document.submit(url);
		return;
	}
	
	var self = this;
	this.stateChangeRequest.onreadystatechange=function() {
		if (self.stateChangeRequest.readyState!=4) return;
		if (self.stateChangeRequest.status != 200) {
			document.write(self.stateChangeRequest.responseText);
			//alert("An error occurred: " + self.stateChangeRequest.status);
		}

		var responseText = self.stateChangeRequest.responseText;

		var links = responseText.match(/<a[^>]+id="CLP_A_[^>]+>/ig);
		if (links && (links.length>0)) {
			for (var i = 0 ; i < links.length; ++i) {
				var link = links[i];
				link.match(/id="([^"]+)"/);
				var id = RegExp.$1;
				link.match(/href="([^"]+)"/);
				var href=RegExp.$1;
				var e = document.getElementById(id);
				var oldHref = clpStripId(e.href);
				var newHref = clpStripId(href);
				if (oldHref!=newHref) {
					self.changes.push(e.href);
					self.changesNew.push(href);
				}
				if (e) e.href = href; 
			}
			var imgs = responseText.match(/<img[^>]+id="CLP_IMG_[^>]+>/ig);
			for (var i = 0 ; i < imgs.length; ++i) {
				var img = imgs[i];
				img.match(/id="([^"]+)"/i);
				var id = RegExp.$1;
				img.match(/src="([^"]+)"/i);
				var src = RegExp.$1;
				img.match(/title="([^"]+)"/i);
				var title = RegExp.$1;
				var e = document.getElementById(id);
				if (e) {
					e.src=src;
					e.title=title;
					e.alt=title;
				}
			}
		} else {
			document.write(responseText);
		}
		clpHandleNextObject(self);
	};
	if (this.stateChangeRequest.onerror) {
		this.stateChangeRequest.onerror=function() {
			try {
				var errorWin = window.open('', 'errorWin');
				errorWin.document.body.innerHTML = self.stateChangeRequest.responseText;
			} catch (e) {
				alert('An error occurred, but the error message cannot be '
				     + 'displayed. This is probably because of your browser\'s '
				     + 'pop-up blocker.\n'
				     + 'Please allow pop-ups from this web site if you want to '
				     + 'see the full error messages.\n'
				     + '\n'
				     + 'Status Code: ' + self.stateChangeRequest.status + '\n'
				     + 'Status Description: ' + self.stateChangeRequest.statusText);
			}
			
			clpHandleNextObject(self);
		};
	}
	this.stateChangeRequest.open("GET", this.url, true);
	this.stateChangeRequest.send(null);
}
function clpStripId(url) {
	return url.replace(/clpid=\d+;/i,"");
}
function clpGetStateChangeObject(url) {
	for (var i=0; i<clpStateChangeObjectArray.length; ++i) {
		if (clpStripId(clpStateChangeObjectArray[i].url)==clpStripId(url)) return clpStateChangeObjectArray[i];
	}
	return null;
}
var clpSubmitItemStateChangeMutex = 0;
function submitItemStateChange(url) {
	while (clpSubmitItemStateChangeMutex>0) { alert("You click to fast for me"); }
	clpSubmitItemStateChangeMutex++;
	var newStateChangeObject = new ClpStateChangeObject(url);
	if (clpStateChangeObjectArray.length>0) {
		clpStateChangeObjectArray.push(newStateChangeObject);
	} else {
		clpStateChangeObjectArray.push(newStateChangeObject);
		newStateChangeObject.clpDoIt();
	}
	clpSubmitItemStateChangeMutex--;
}