var xmlHttp

function showTownList(string)
{
  //remove options
  
   var i;
   
   for(i=document.getElementById('plemenoAjax').options.length-1;i>=0;i--)
   {
     document.getElementById('plemenoAjax').remove(i);
   }

	if (string.lenght == 0 || string == "%")
	{
		document.getElementById('plemenoAjax').options[0] = new Option('Nic', 'nic');
		return;
	}
	xmlHttp = GetXmlHttpObject();
	if (xmlHttp == null)
	{
		alert ("Tvůj internetový prohlížeč nepodporuje AJAX!");
		return;
	}
	var url="/ajax/getPlemena.php";
	url=url+"?word="+string;
	url=url+"&sid="+Math.random();
	xmlHttp.onreadystatechange = stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function stateChanged()
{
	if (xmlHttp.readyState == 4)
	{
	  var option = xmlHttp.responseText;
    var onerow = option.split("$");
    var index;
    for (index=0; index < onerow.length; index = index+1)
    {      
      var splitted = onerow[index].split(";");
      document.getElementById('plemenoAjax').options[index] = new Option(splitted[1], splitted[0]);
    }
    if (onerow.length < 2)
    {
      document.getElementById('plemenoAjax').options[index] = new Option("", "");
    }    
  }
}

function GetXmlHttpObject()
{
	var xmlHttp=null;
	try
	{
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	}
	catch (e)
	{
		// Internet Explorer
		try
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}