/*
General functions for Yotta
Copyright (c) 2003-2008 Ylab, www.ylab.nl
Author: Yohan Creemers
*/
var debugging = true;
var isIE = (navigator.appName.indexOf("Internet Explorer") != -1);
//todo
var languageCode = "nl";

//window.onerror = reportError;
function reportError(msg, url, line){
	var txt = (languageCode == "nl") ? "Er is een fout opgetreden. Meld dit a.u.b. aan de webmaster." : "An error occured. Please contact webmaster.";
	window.status = txt + " | " + line + ": " + msg;
	return true;
}
var loadFunctions = new Array();
function addLoadFunction(f) {loadFunctions[loadFunctions.length] = new Function(f);}
window.onload   = function(){for (var i=0; i<loadFunctions.length; i++){loadFunctions[i]();}}

//Convert id into object
function id2object(el){
	if(typeof(el)=="string"){el = document.getElementById(el);}
	return el;
}
/* quick getElement reference */
function $byId(){
	var elements = new Array();
	for (var i = 0; i < arguments.length; i++){
		var element = id2object(arguments[i]);
		if(arguments.length == 1){
			return element;
		}
		elements.push(element);
	}
	return elements;
}

function addEvent(obj, handler, f){
	if(!obj){return;}
	//prepare method storage
	if(!obj.methods){obj.methods = new Array();}
	if(!obj.methods[handler]){obj.methods[handler] = new Array();}
	//the generic method wich will call the actual methods
	var parentMethod = function(){callMethodsForEvent(this, handler);}
	if(!obj[handler]){
		obj[handler] = parentMethod;
	}
	else if(obj[handler].toString() != parentMethod.toString()){
		//store existing method
		obj.methods[handler].push(obj[handler]);
		obj[handler] = parentMethod;
	}
	//store new method
	if(typeof(f) != "function"){f = new Function(f);}
	obj.methods[handler].push(f);
}

function callMethodsForEvent(obj, handler){
	if(!obj.methods || !obj.methods[handler]){return;}
	for (var i=0; i<obj.methods[handler].length; i++){
		if(obj.methods[handler][i].apply){
			obj.methods[handler][i].apply(obj);
		}
		else{
			//for ie5.0 jscript5.0
			eval(obj.methods[handler][i]);
		}
	}
}

//Set focus on first input element
function setFirstFieldFocus(container){
	if(container.tagName == "FORM"){
		var list = container.elements;
	}
	else{
		var list = container.getElementsByTagName("input");
	}
	for (var i=0; i< list.length; i++){
		try{
			if(list[i].type == "button"){continue;}
			list[i].focus();
			if(list[i].select){list[i].select();}
			break;
		}
		catch (exception){}
	}
}

//enable or disable elements and their children
function setEnabled(on){
	for (var i=1; i<arguments.length; i++){
		var obj = id2object(arguments[i]);
		if(!obj){return;}
		obj.disabled = !on;
		if(on){
			removeClass(obj, 'disabled');
		}
		else{
			addClass(obj, 'disabled');
		}
		if(obj.hasChildNodes()){
			for (var j=0; j<obj.childNodes.length; j++){
				if(obj.childNodes[j].nodeType == 1){setEnabled(on, obj.childNodes[j]);}
			}
		}
	}
}

function addClass(obj, strClass){
	if(!obj){return;}
	if(!obj.className){
		obj.className = strClass;
	}
	else if(!obj.className.match(strClass)){
		obj.className += ' ' + strClass;
	}
}

function removeClass(obj, strClass){
	if(!obj || !obj.className){return;}
	 obj.className = obj.className.replace(strClass, '');
}

//set a style property or fail gracefully
function setStyle(objectId, prop, value){
	var obj = document.getElementById(objectId);
	if((obj) && (obj.style[prop] != value)){
		obj.style[prop] = value;
	}
}

function getCookie(name){
	//Function to return the value of the cookie specified by "name".
	//returns: String object containing the cookie value, or null if the cookie does not exist.

	var arg = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;

	while (i < clen){
		var j = i + alen;
		if(document.cookie.substring(i, j) == arg)
			return getCookieVal (j);
		i = document.cookie.indexOf(" ", i) + 1;
		if(i == 0) break;
	}
	return null;
	function getCookieVal(offset){
		//Internal function to return the decoded value of a cookie
		var endstr = document.cookie.indexOf (";", offset);

		if(endstr == -1) endstr = document.cookie.length;
		return unescape(document.cookie.substring(offset, endstr));
	}
}

function setCookie(name, value){
	//Function to create or update a cookie for calling document.
	document.cookie = name + "=" + escape (value);
}

function xmlGetValues(xmlDoc, tag){
	var values = xmlDoc.getElementsByTagName(tag)
	if(values){
		if(values.length == 1){
			return values[0].hasChildNodes() ? values[0].firstChild.data : null;
		}
		if(values.length > 1){
			var results = new Array();
			for (var i =0; i<values.length; i++){
				results[i] = values[i].hasChildNodes() ? values[i].firstChild.data : null;
			}
			return results;
		}
	}
	return null;
}

function $_GET(){
	var q = location.search;
	if(q.length > 1){
		q = q.substring(1);
	}
	else{
		return null;
	}
	var pairs = q.split("&");
	for(var i=0; i < pairs.length; i++) {
		this[pairs[i].split("=")[0]] = pairs[i].split("=")[1];
	}
	return this;
}

function scrollRowIntoView(pageref, param){
	var scrTop = getCookie(pageref);
	var get = $_GET();

	if(scrTop){
		//set scrollTop
		if(document & document.documentElement){
			document.documentElement.scrollTop = scrTop;
		}
		//delete scrollTop stored in Cookie
		setCookie(pageref, '');
	}
	if(get && get[param]){
		var row = id2object(get[param]);
		if(row){
			//hilite row
			row.className = 'listview-hilite';
			if(!scrTop){
				//no scrollTop stored in Cookie, scroll row into view
				row.scrollIntoView();
			}
		}
	}
}

//DEBUGGING
function devAlert(){
	if(!debugging){return;}
	var code = "Deze functie is nog niet geïmplementeerd.\n";
	for(var i=0; i < arguments.length; i++){
		code += arguments[i] + "\n";
	}
	alert(code);
}

function debugAlert(){
	if(!debugging){return;}
	var code = "";
	for(var i=0; i < arguments.length; i++){
		code += arguments[i] + "\n";
	}
	code += '\nKlik op Annuleren om verdere meldingen te onderdrukken.';
	debugging = confirm(code);
}

function debugConfirm(){
	if(!debugging){return;}
	var code = "";
	for(var i=0; i < arguments.length; i++){
		code += arguments[i] + "\n";
	}
	return confirm(code);
}

if(!Array.prototype.push){
	Array.prototype.push = function(){
		for(var i=0; i<arguments.length; i++){
			this[this.length] = arguments[i];
		}
		return this.length;
	}
}

if(!Array.prototype.in_array){
	Array.prototype.in_array = function(element){
		var i;

		for (i=0; i<this.length; i++){
			if (this[i] == element){
				return true;
			}
		}
		return false;
	};
}