function tellafriend(url,lang)
{
	if (document.getElementById("tellafriendbox"))
	{
		var tafBox = document.getElementById("tellafriendbox");
		document.body.removeChild(tafBox);
	} else {
		// element erstellen
		var	 tafBox = document.createElement("div");
	
		// class zuornden IE und rest der welt
		tafBox.setAttribute("class","tellafriendbox");
		tafBox.className="tellafriendbox";
		tafBox.id = "tellafriendbox";
		
		
		// lang
		if (lang == "de")
		{
			var IhreEmail = 'Ihre Emailadresse';
			var EmpfaengerEmail = 'Empfänger Emailadresse';
			var Abschicken = 'abschicken';
		} else {
			var IhreEmail = 'Your Email';
			var EmpfaengerEmail = 'Recipient Email';
			var Abschicken = 'mail';
		}
		// element befüllen
		tafBox.innerHTML = "<form name=\"tellafriendformular\" id=\"tellafriendformular\" onsubmit=\"return checkInput('"+lang+"')\" action=\"http://www.projects4students.net/tellafriend.php\" method=\"get\"><center><table style=\"width:500px;\"><tr><td>"+IhreEmail+"</td><td>"+EmpfaengerEmail+"</td><td>&nbsp;</td></tr><tr><td><input type=\"text\" id=\"absender\" name=\"absender\" value=\"\" /></td><td><input type=\"text\" id=\"empfaenger\" name=\"empfaenger\" value=\"\" /><input type=\"hidden\" id=\"urllink\" name=\"urllink\" value=\""+url+"\" /></td><td><input type=\"submit\" name=\"senden\" value=\""+Abschicken+"\" /></td></tr></table></center><form>";
	
		// ins dokument einfügen
		document.body.insertBefore(tafBox,document.getElementById("fis_footer"));
	}
}

function checkInput(lang)
{
	// formular ausblenden
	//var tafFormular = document.getElementById("tellafriendformular");
	//tafFormular.style.display = 'none';
	
	var absender = document.getElementById("absender").value;
	var empfaenger = document.getElementById("empfaenger").value;
	var urllink = document.getElementById("urllink").value;
	
	// lang
		if (lang == "de")
		{
			var Message = '<center><br />Vielen Dank!<br />Ihre Nachricht wurde versendet.</center>';
		} else {
			var Message = '<center><br />Thank you<br />Your Mail will be delivered soon.</center>';
		}
	
	new Ajax.Request('http://www.projects4students.at/tellafriend.php?',   
		{     
			method:'get',
			parameters: {absender: absender, empfaenger: empfaenger, urllink: urllink},
			onSuccess: function(transport){       
						var response = transport.responseText || "no response text";
						
						response = removeNL(response);
						
						if (response == "ok")
						{
							// tell a friend ausblenden
							var tafBox = document.getElementById("tellafriendbox");
							tafBox.innerHTML = Message ;
						} else {
							alert('['+response+']');
						}    
					},     
			onFailure: function(){ alert('Bitte versuchen Sie es in ein paar Minuten erneut.') }   
		}); 
	
	return false;
}

function removeNL(s) {
  /*
  ** Remove NewLine, CarriageReturn and Tab characters from a String
  **   s  string to be processed
  ** returns new string
  */
  r = "";
  for (i=0; i < s.length; i++) {
    if (s.charAt(i) != '\n' &&
        s.charAt(i) != '\r' &&
        s.charAt(i) != '\t') {
      r += s.charAt(i);
      }
    }
  return r;
  }