/**
 * general.js
 *
 * Copyright (c) 2003-2008 John Willinsky
 * Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
 *
 * Site-wide common JavaScript functions. 
 *
 * $Id: general.js,v 1.25 2008/06/13 20:16:45 asmecher Exp $
 */

/**
 * Prompt user for confirmation prior to loading a URL.
 
 

function isIe()
{
 if(/Firefox[\/\s](\d+\.\d+)/.test(navigator.userAgent))
 	return false; 
 else 
	return true;
}

*/

var isIE = document.all ? true : false;
var _x;
var _y;
var _mlog_records = 0;

function UpdateCursorPosition(e)
{
	_x = e.pageX; _y = e.pageY;
	//mlog("_x: " + _x + " _y: " + _y);
}
function UpdateCursorPositionDocAll(e)
{ 
	_x = window.event.clientX; _y = window.event.clientY;
	//mlog("_x: " + _x + " _y: " + _y);
}
if(document.all) { document.onmousemove = UpdateCursorPositionDocAll; }
else { document.onmousemove = UpdateCursorPosition; }

//if (document.addEventListener)
//{
//    document.addEventListener("mousemove",getMousePosition, false);
//}
//else if (document.attachEvent)
//{
//    document.attachEvent("mousemove",getMousePosition);
//}
//
//function getMousePosition(e) 
//{
//	if(!e)
//		e = window.event;
//	if(isIE)
//	{
//		//_x = event.clientX + document.body.scrollLeft  - document.body.clientLeft;
//		//_y = event.clientY + document.body.scrollTop - document.body.clientTop;
//		var d= (document.documentElement && 
//              document.documentElement.scrollLeft != null) ?
//             document.documentElement : document.body;
//    _x = e.clientX + document.body.scrollLeft;
//    _y = e.clientY + document.body.scrollTop;
//
//	} else {
//		//if(E.layerX)
//			_x = e.pageX;
//		//else
//			//_x = E.offsetX;
//			
//		//if(E.layerY)
//			_y = e.pageY;
//		//else
//			//_y = E.offsetY;
//	}
//	
//	mlog("_x: " + _x + " _y: " + _y);
//
//	return true;
//}

 
function mlog(msg)
{
	var d = document.getElementById('log_div');
	
	if(!d)
	{
		var d = document.createElement("div");
		d.id = 'log_div';
		//var c = document.getElementById('content');
		//if(isIE)
			//document.body.insertBefore(d);
		//else
		if(document.body)
			document.body.appendChild(d);
		else
			return;
		//c.appendChild(d);
	}
	
	//var scr = window.screen;
	d.style.position = 'absolute';
	/*d.style.display = 'block';
	window.event.clientX, and windows.event.clientY
	*/
	d.style.left = 2 + 'px';
	//if(isIE)
		//d.style.top = window.event.clientY;
	//else
	d.style.top = _y + 'px';
	d.style.backgroundColor = 'white';
	d.style.color = 'green';
	d.style.border = '1px solid red';
	d.style.padding = '10px';
	d.style.fontSize = '10px';
	d.style.zIndex = 2;
	d.style.float = 'left';
	
	if(_mlog_records++ >= 20)
	{
		d.innerHTML = '<br/>' + msg;
		_mlog_records = 0;
	}
	else
		d.innerHTML = d.innerHTML + '<br/>' + msg;
}	


function confirmAction(url, msg) {
	if (confirm(msg)) {
		if (url) {
			document.location.href=url;
		}
		return true;
	}
	return false;
}

/**
 * Open window displaying help.
 */
function openHelp(url) {
	window.open(url, 'Help', 'width=700,height=600,screenX=100,screenY=100,toolbar=0,scrollbars=1');
}

/**
 * Open window displaying comments.
 */
function openComments(url) {
	window.open(url, 'Comments', 'width=700,height=600,screenX=100,screenY=100,toolbar=0,resizable=1,scrollbars=1');
}

/**
 * Open window for preview.
 */
function openWindow(url) {
	window.open(url, 'Window', 'width=600,height=550,screenX=100,screenY=100,toolbar=0,resizable=1,scrollbars=1');
}

/**
 * Open window for reading tools.
 */
function openRTWindow(url) {
	window.open(url, 'RT', 'width=700,height=500,screenX=100,screenY=100,toolbar=0,resizable=1,scrollbars=1');
}
function openRTWindowWithToolbar(url) {
	window.open(url, 'RT', 'width=700,height=500,screenX=100,screenY=100,toolbar=1,resizable=1,scrollbars=1');
}

/**
 * browser object availability detection
 * @param objectId string of object needed
 * @param style int (0 or 1) if style object is needed
 * @return javascript object specific to current browser
 */
function getBrowserObject(objectId, style) {
	var isNE4 = 0;
	var currObject;

	// browser object for ie5+ and ns6+
	if (document.getElementById) {
		currObject = document.getElementById(objectId);
	// browser object for ie4+
	} else if (document.all) {
		currObject = document.all[objectId];
	// browser object for ne4
	} else if (document.layers) {
		currObject = document.layers[objectId];
		isNE4 = 1;
	} else {
		// do nothing
	}
	
	// check if style is needed
	if (style && !isNE4) {
		currObject = currObject.style;
	}
	
	return currObject;
}

/**
 * Load a URL.
 */
function loadUrl(url) {
	document.location.href=url;	
}

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

/**
 * Asynchronous request functions
 */
function makeAsyncRequest(){
	var req=(window.XMLHttpRequest)?new XMLHttpRequest():new ActiveXObject('Microsoft.XMLHTTP');
	return req;
}

function sendAsyncRequest(req, url, data, method) {
	var header = 'Content-Type:text/html; Charset=utf-8';
	req.open(method, url, true);
	req.setRequestHeader(header.split(':')[0],header.split(':')[1]);
	req.send(data);
}


/**
 * Change the form action
 * @param formName string
 * @param action string 
 */
function changeFormAction(formName, action) {
	document.forms[formName].action = action;
	document.forms[formName].submit();
}