function changeLang(lang) {
	location.href = linkprefix + 'change.php?l=' + lang;
}

function getNodeValue(obj,tag) { /* XML uitlezen */
    return obj.getElementsByTagName(tag)[0].firstChild.nodeValue;
}

function getSingleData(response,tag) { /* XML uitlezen */
	return response.getElementsByTagName(tag)[0].firstChild.data;
}

function doorsturen(url) {
	setOverlay('active');

	$('doorsturen').style.display = 'block';

	$('doorsturenSluiten').onclick=function() {
		$('doorsturen').style.display = 'none';
		setOverlay('inactive');
	}
}

function sendDoorsturen() {
	// vars
	var doorsturen_url = $('doorsturen_url').value;
	var doorsturen_email_ontvanger = $('doorsturen_email_ontvanger').value;
	var doorsturen_naam_verzender = $('doorsturen_naam_verzender').value;
	var doorsturen_email_verzender = $('doorsturen_email_verzender').value;
	var doorsturen_onderwerp = $('doorsturen_onderwerp').value;
	var doorsturen_bericht = $('doorsturen_bericht').value;
	
	var fout = false;
	var foutmelding = textDoorsturen[1001] + '\n';
	
	if(doorsturen_naam_verzender == '') {
		foutmelding += '- ' + textDoorsturen[1002] + '\n';
		fout = true;
	}
	
	if(doorsturen_email_verzender == '') {
		foutmelding += '- ' + textDoorsturen[1003] + '\n';
		fout = true;
	}
	
	if(doorsturen_email_ontvanger == '') {
		foutmelding += '- ' + textDoorsturen[1004] + '\n';
		fout = true;
	}
	
	if(fout) {
		alert(foutmelding);	
	}
	else {
		// Maak een ajax-request om de pagina door te sturen
		var url = linkprefix + 'XML/doorsturen.php';
		var pars =  'doorsturen_url=' + doorsturen_url +
					'&doorsturen_naam_verzender=' + doorsturen_naam_verzender +
					'&doorsturen_email_verzender=' + doorsturen_email_verzender +
					'&doorsturen_email_ontvanger=' + doorsturen_email_ontvanger +
					'&doorsturen_onderwerp=' + doorsturen_onderwerp +
					'&doorsturen_bericht=' + doorsturen_bericht;
		
		var myAjax = new Ajax.Request(
		url, 
		{
			method: 'post', 
			parameters: pars, 
			onComplete: function(originalRequest) {
				var response = originalRequest.responseXML;
				
				var status = getSingleData(response,'status');
				var bericht = getSingleData(response,'bericht');
				
				alert(bericht);
				
				if(status == 0) {
					$('doorsturen_naam_verzender').value = '';
					$('doorsturen_email_verzender').value = '';
					$('doorsturen_email_ontvanger').value = '';
					$('doorsturen_onderwerp').value = 'Website YEP Africa';
					$('doorsturen_bericht').value = '';
					$('doorsturen').style.display = 'none';
					setOverlay('inactive');
				}
			}
		});
	}
}

function setOverlay(state) { /* Overlay laten zien of weghalen */

	var arrPage = getPageSize();

	if(state == 'inactive') {
		// Bij IE 6 de selects terugzetten
		if(BrowserDetect.browser == "Explorer" && BrowserDetect.version == "6") {
			var selects = collectionToArray(document.getElementsByTagName("select"));
			for(i=0;i<selects.length;i++) {
					selects[i].style.visibility = 'visible';
			}
		}
		
		document.getElementById('overlay').style.display = 'none';
	} else {
		// Bij IE 6 de selects weghalen
		if(BrowserDetect.browser == "Explorer" && BrowserDetect.version == "6") {
			var selects = collectionToArray(document.getElementsByTagName("select"));
			for(i=0;i<selects.length;i++) {
					selects[i].style.visibility = 'hidden';
			}
		}

		if(document.getElementById('overlay')) {
			document.getElementById('overlay').style.display = 'block';
		} else {
			var newdiv = document.createElement('div');
			newdiv.setAttribute('id', 'overlay');
			document.body.appendChild(newdiv);
			$('overlay').style.width = arrPage[0] + 'px';
			$('overlay').style.height = arrPage[1] + 'px';
		}
	}
}

/* Browser detectie */
var BrowserDetect = {
	init: function () {
		this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
		this.version = this.searchVersion(navigator.userAgent)
			|| this.searchVersion(navigator.appVersion)
			|| "an unknown version";
		this.OS = this.searchString(this.dataOS) || "an unknown OS";
	},
	searchString: function (data) {
		for (var i=0;i<data.length;i++)	{
			var dataString = data[i].string;
			var dataProp = data[i].prop;
			this.versionSearchString = data[i].versionSearch || data[i].identity;
			if (dataString) {
				if (dataString.indexOf(data[i].subString) != -1)
					return data[i].identity;
			}
			else if (dataProp)
				return data[i].identity;
		}
	},
	searchVersion: function (dataString) {
		var index = dataString.indexOf(this.versionSearchString);
		if (index == -1) return;
		return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
	},
	dataBrowser: [
		{ 	string: navigator.userAgent,
			subString: "OmniWeb",
			versionSearch: "OmniWeb/",
			identity: "OmniWeb"
		},
		{
			string: navigator.vendor,
			subString: "Apple",
			identity: "Safari"
		},
		{
			prop: window.opera,
			identity: "Opera"
		},
		{
			string: navigator.vendor,
			subString: "iCab",
			identity: "iCab"
		},
		{
			string: navigator.vendor,
			subString: "KDE",
			identity: "Konqueror"
		},
		{
			string: navigator.userAgent,
			subString: "Firefox",
			identity: "Firefox"
		},
		{
			string: navigator.vendor,
			subString: "Camino",
			identity: "Camino"
		},
		{		// for newer Netscapes (6+)
			string: navigator.userAgent,
			subString: "Netscape",
			identity: "Netscape"
		},
		{
			string: navigator.userAgent,
			subString: "MSIE",
			identity: "Explorer",
			versionSearch: "MSIE"
		},
		{
			string: navigator.userAgent,
			subString: "Gecko",
			identity: "Mozilla",
			versionSearch: "rv"
		},
		{ 		// for older Netscapes (4-)
			string: navigator.userAgent,
			subString: "Mozilla",
			identity: "Netscape",
			versionSearch: "Mozilla"
		}
	],
	dataOS : [
		{
			string: navigator.platform,
			subString: "Win",
			identity: "Windows"
		},
		{
			string: navigator.platform,
			subString: "Mac",
			identity: "Mac"
		},
		{
			string: navigator.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]

};
BrowserDetect.init();

/* Pagina grootte */
function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else if (document.documentElement && document.documentElement.scrollHeight > document.documentElement.offsetHeight){ // Explorer 6 strict mode
		xScroll = document.documentElement.scrollWidth;
		yScroll = document.documentElement.scrollHeight;
	} else { // Explorer Mac...would also work in Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) { // all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else {
		pageHeight = yScroll;
	}
	
	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}
	
	
	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)
	return arrayPageSize;
}

function collectionToArray(col) {
	a = new Array();
	for (i = 0; i < col.length; i++)
		a[a.length] = col[i];
	return a;
}