/* --------------------------- */

function open_tellafriend(complete) {
	var popup = complete ? document.getElementById('titaf_form_complete') : document.getElementById('titaf_form');
	if (popup) {
		show_overlay();
		center_layer(popup, 287, 150);
		popup.style.display = '';
	}
}

function close_tellafriend(complete) {
	var popup = complete ? document.getElementById('titaf_form_complete') : document.getElementById('titaf_form');
	if (popup) {
		hide_overlay();
		popup.style.display = 'none';
	}
}


function show_overlay() {
	var ua = new UserAgent();
	var body = document.getElementsByTagName("body")[0];
	var overlay = document.createElement('div');
	overlay.id = 'overlay';

	with (overlay.style) {
/*		display = 'none';*/
		position = 'fixed';
		top = '0px';
		left = '0px';
		zIndex = '50';
		width = '100%';
		height = '100%';
	}

	if (ua.isWinIE) {
		overlay.style.position = 'absolute';
		overlay.style.height = (body.scrollHeight > body.clientHeight ? body.scrollHeight : body.clientHeight) + 'px';
	}
	//addEvent(overlay,"click",function() { hide_overlay(); });
	body.appendChild(overlay);

}

function hide_overlay() {
	var overlay = document.getElementById('overlay');
	overlay.parentNode.removeChild(overlay);
}

function UserAgent() { // user agent information
	var ua = navigator.userAgent;
	this.isWinIE = this.isMacIE = false;
	this.isGecko  = ua.match(/Gecko\//);
	this.isSafari = ua.match(/AppleWebKit/);
	this.isOpera  = window.opera;
	if (document.all && !this.isGecko && !this.isSafari && !this.isOpera) {
		this.isWinIE = ua.match(/Win/);
		this.isMacIE = ua.match(/Mac/);
		this.isNewIE = (ua.match(/MSIE 5\.5/) || ua.match(/MSIE 6\.0/));
	}
	return this;
}

function addEvent(object, type, handler) {
	if (object.addEventListener) {
		object.addEventListener(type, handler, false);
	} else if (object.attachEvent) {
		object.attachEvent(['on',type].join(''),handler);
	} else {
		object[['on',type].join('')] = handler;
	}
}


function center_layer(layer, layer_width, top_offset) {
	if (!layer) return;
	var docElem = (window.document.documentElement) ? window.document.documentElement : docElem = window.document.body
	var scroll_top = window.pageYOffset ? window.pageYOffset : docElem.scrollTop;
	var page_width = (docElem.scrollWidth ? docElem.scrollWidth : docElem.offsetWidth);

	layer.style.left = ((page_width - layer_width) / 2) + 'px';
	layer.style.top = (top_offset + scroll_top) + 'px';

}

function submitAjaxForm(frm, callback) {
	if (typeof(frm) != 'object') frm = document.forms[frm];

	if (frm) {

		arguments = '';
		for (i = 0; i < frm.elements.length; ++i) {

			cElement = frm.elements[i];
			if (cElement.tagName && cElement.tagName == 'INPUT') {
				arguments += (arguments ? '&' : '?') + cElement.name + '=' + escape(cElement.value);
			}
		}

		url = frm.action + arguments;
		xmlHttp.post(url, 'titaf', callback);
	}
}

function setTitafComplete(id) {
	close_tellafriend(); //-- close form-popup
	open_tellafriend(true); //-- open msg-popup
}

function submitTellafriend() {
	frm = document.forms['titaf'];
	if (frm) {
		if (autoCheckForm(frm)) {
			submitAjaxForm(frm, 'setTitafComplete'); 
		}
	}
}



function saveVote(form) {
	submitAjaxForm(form, 'setPollResult');
}

function setPollResult(response) {
	document.getElementById('poll_holder').innerHTML = response;
}

function checkSubscribeForm() {
    email = $('#email_sender');
    ean   = $('#eancode');

    state = true;
    message = 'De volgende velden zijn niet correct ingevuld: \n';
    emailRegEx = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

    if (!email.val().match(emailRegEx)) {
        state = false;
        message += ' - E-mailadres\n';
    }

    if (ean.val() != '9521') {
        state = false;
        message += ' - EAN-code\n';
    }

    if (state) {
        return true;
    } else {
        alert(message);
        return false;
    }
}