/*
*******************************************************************************
					Copyright (c) 2005, 2006 John Ha
*******************************************************************************
This work is licensed under the Creative Commons Attribution License. To view
a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/2.5/
*******************************************************************************
If this code has helped you in anyway, any acknowledgement would be appreciated
*******************************************************************************
*/

/*
	Attach event handler to object
*/
function addEvent(obj, evType, fn, cap) {
	if (obj.addEventListener) {
		obj.addEventListener(evType, fn, cap);
		return true;
	} else if (obj.attachEvent) {
		var r = obj.attachEvent('on' + evType, fn);
		return r;
	} else alert('Handler could not be attached');
}

/*
	Remove event handler reference from object
*/
function removeEvent(obj, evType, fn, cap){
	if (obj.removeEventListener){
		obj.removeEventListener(evType, fn, cap);
		return true;
	} else if (obj.detachEvent){
		var r = obj.detachEvent('on' + evType, fn);
		return r;
	} else alert("Handler could not be removed");
} 

/*
	Waits for object to become available
	before executing target function, or
	else times out.
	fn:		function (string)
	objID:	object ID (string)
	t:		timeout (milliseconds)
	e:		output error message (boolean)
*/
function wait4obj(fn, objID, t, e) {
	var n = 20;
	t > 0 ?
		document.getElementById(objID) ?
			eval(fn)
		:	setTimeout("wait4obj('" + fn + "', '" + objID + "', " + (t - n) + ", " + e + ")", n)
		/* Output error message? */
	:	e ? alert(fn + ' timed out.\n[' + objID + '] not found!') : 0;
}

/*
	setTimeout is used to make sure target
	functions are executed completely
	independent from event handler, since
	certain code balks when placed within
	an event handler.
	fn:		function (string)
	objID:	object ID (string)
	t:		timeout (milliseconds)
	e:		output error message (boolean)
*/
function schedule(fn, objID, t, e) {
	// Attach onload...
	addEvent(window, 'load', function () {
		// Look for object to attach to?
		objID ?
			/* Yes, then make sure object exists... */
			document.getElementById(objID) ?
				/* If object found... */
				eval('setTimeout("' + fn + '", 0)')
				/* Else wait till object exists or timeout */
			:	wait4obj(fn, objID, (t ? t : 1000), e)
		/* Object not specified - just attach on load handler */
		:	eval('setTimeout("' + fn + '", 0)');
	}, false);
}

function setCookie(cookieName,cookieValue,nDays) {
	var today = new Date();
	var expire = new Date();
	if (nDays==null || nDays==0) nDays = 1;
	expire.setTime(today.getTime() + 3600000*24*nDays);
	document.cookie = cookieName + '=' + escape(cookieValue) + ';expires=' + expire.toGMTString();
}

function readCookie(cookieName) {
	var theCookie = '' + document.cookie;
	var ind = theCookie.indexOf(cookieName);
	if (ind == -1 || cookieName == '') return '';
	var ind1 = theCookie.indexOf(';', ind);
	if (ind1 == -1) ind1 = theCookie.length;
	if (ind + cookieName.length == theCookie.indexOf(';', ind)) return '';
	else return unescape(theCookie.substring(ind + cookieName.length + 1, ind1));
}

// delay in milliseconds
function delay(t) {
	date = new Date();
	var curDate = null;
	do curDate = new Date();
	while(curDate - date < t);
}