var fault_mac = 'Functionality does not work on MAC: \n Please bookmark the site manually.';
var fault_no_mie = 'Functionality requires Microsoft Internet Explorer V4.0 (or higher): \n Please bookmark the site manually.';

	function bookmark(website, title)
	{
		/*Note:
			bookmarking is only allowed with IE 4.0 or higher and not on a MAC
			var website must start with 'http://' in order to work properly!!!
		*/	
		var ver = navigator.appVersion;
		ver = ver.substr(0, ver.indexOf('(')-1);	
		var num = parseFloat(ver);		
		if ((navigator.platform!="MacPPC") && (navigator.appName=="Microsoft Internet Explorer") && (num>=4))
	   {	
			window.external.addFavorite(website,title);
		}
		else
		{
			if (navigator.platform=="MacPPC")
			{
				alert(fault_mac);
			}
			if ((navigator.appName!="Microsoft Internet Explorer") || (navigator.appVersion<4))
			{
				alert(fault_no_mie);
			}	
		}
	}

	function open_customerservice() {
		window.open('customerservice/customerservice_index.php', 'Kundenservice','toolbar=no,directories=no,status=no,scrollbars=no,resize=no,menubar=no,width=480,height=360,top=100,left=200');
		return false;
	}

	function open_ctelco() {
		window.open('cheapertelco.php?frominfo=true', 'Cheapertelco','toolbar=no,directories=no,status=no,scrollbars=no,resize=no,menubar=no,width=480,height=360,top=100,left=200');
		return false;
	}


	function open_faq() {
		window.open('customerservice/customerservice_question_index.php?frominfo=true', 'FAQ','toolbar=no,directories=no,status=no,scrollbars=no,resize=no,menubar=no,width=480,height=360,top=100,left=200');
		return false;
	}

	function open_tellafriendemail() {
		window.open('tellafriend_email.php', 'TellAFriend','toolbar=no,directories=no,status=no,scrollbars=no,resize=no,menubar=no,width=480,height=360,top=100,left=200');
		return false;
	}

	function open_callafriend() {
		window.open('callafriend.php', 'CallAFriend','toolbar=no,directories=no,status=no,scrollbars=no,resize=no,menubar=no,width=480,height=430,top=100,left=200');
		return false;
	}

	function open_tellafriendphone() {
		window.open('tellafriend/tellafriend_phone.php', 'TellAFriend','toolbar=no,directories=no,status=no,scrollbars=no,resize=no,menubar=no,width=600,height=500,top=100,left=200');
		return false;
	}
	function open_tellafriendsms() {
		window.open('tellafriend/tellafriend_sms.php', 'TellAFriend','toolbar=no,directories=no,status=no,scrollbars=no,resize=no,menubar=no,width=600,height=500,top=100,left=200');
		return false;
	}		
	function open_printrates() 
	{
		window.open('printrates.php','tarife','scrollbars=yes, status=yes, menubar=yes, toolbar=yes, location=no, resizable=yes, width=700,height=450');
		return false;
	}
	
	function open_pop_callcharges() {
		window.open('tariffnotice.php','tariffnotice','toolbar=no,directories=no,status=no,scrollbars=no,resize=no,menubar=no,width=480,height=360,top=100,left=200'); 
	}		
	function isEmail(address) {
		var isValid = false;
		// basic checks (relying on lazy evaluation for correct behaviour!)
		// not empty
		// at least 7 characters (x@yy.zz)
		// has @
		// has only 1 @
		// has at least one . (domain.ext)
		isValid = (address!=null) 
		       && (address.length >= 7) 
		       && (address.indexOf('@')!=-1) 
		       && (address.indexOf('@') == address.lastIndexOf('@'))
		       && (address.indexOf('.')!=-1)
		;
		
		if (isValid) {
			var parts = address.split('@');
			var name  = parts[0].split('.');
			var host  = parts[1].split('.');
			var regName  = new RegExp("^([!#$%&'*+-/0-9=?A-Z^_a-z{}~]+)$"); // at least length 1
			var regLabel = new RegExp("^(^[-0-9A-Za-z][-0-9A-Za-z]+)$"); // at least length 2
			var regExt   = new RegExp("^([A-Za-z]{2,63})$"); // at least length 2
			var i;
			for (i=0; i < name.length; i++) {
				isValid = isValid && (name[i].search(regName) != -1);
			}
			for (i=0; i < host.length-1; i++) {
				isValid = isValid && (host[i].search(regLabel) != -1) && (host[i].length <= 63);
			}
			isValid = isValid && (host[host.length-1].search(regExt) != -1);
		}
		return isValid;
	}


	function noenter() {
		return !(window.event && window.event.keyCode == 13); 
	}

	function checkNews(thisform)
	{
		var emailaddress = document.newslettersub.email.value;
		if (isEmail(emailaddress)) document.newslettersub.submit();
		else
		{
			alert('Emailadresse nicht korrekt.\nBitte kontrollieren und Eingabe wiederholen.');
			return false;			
		}
	}

	function checkNews2(thisform)
	{
		var emailaddress = document.newslettersub2.email.value;
		if (isEmail(emailaddress)) document.newslettersub2.submit();
		else
		{
			alert('Emailadresse nicht korrekt.\nBitte kontrollieren und Eingabe wiederholen.');
			return false;			
		}
	}


	function checkNewsOff(thisform)
	{
		var emailaddress = document.newslettersuboff.email.value;
		if (isEmail(emailaddress)) document.newslettersuboff.submit();
		else
		{
			alert('Emailadresse nicht korrekt.\nBitte kontrollieren und Eingabe wiederholen.');
			return false;			
		}
	}
	
	function checkEmail2(thisform)
	{
		var emailaddress = thisform.email.value;
		if (isEmail(emailaddress)) return true;
		else
		{
			alert('Emailadresse nicht korrekt.\nBitte kontrollieren und Eingabe wiederholen.');
			return false;
		}
	}
		function CheckTellafriendForm() {

	var InputName  = document.tellafriend_form.name.value;
	var InputEmail = document.tellafriend_form.email.value;
	var InputFriend1 = document.tellafriend_form.emailfriend1.value;
	var InputFriend2 = document.tellafriend_form.emailfriend2.value;
	var InputFriend3 = document.tellafriend_form.emailfriend3.value;
	
	if ((InputName!='') && (InputEmail!='') && (InputFriend1!='')) {
		if (isEmail(InputEmail)){
			if (isEmail(InputFriend1)) {
				if ((InputFriend2=='') || isEmail(InputFriend2)) {
					if ((InputFriend3=='') || isEmail(InputFriend3)) {
						document.tellafriend_form.submit();
					} else {	alert('Die Emailadresse von Freund ' + ' 3 ' + 'ist falsch.');	}
				} else {		alert('Die Emailadresse von Freund ' + ' 2 ' + 'ist falsch.');	}
			} else {			alert('Die Emailadresse von Freund ' + ' 1 ' + 'ist falsch.');	}
		} else { 			alert ('Emailadresse nicht korrekt.\nBitte kontrollieren und Eingabe wiederholen.'); }
	} else { 				alert ('Bitte füllen Sie alle notwenigen Felder aus.');	}
}