function vyber_termin_plavby(){
  var id=document.getElementById("plavba").value;
  var file='./../sb_plavba.php?plavba=';
  var xmlhttp=false;
  
  try{
  	xmlhttp = new ActiveXObject('Msxml2.XMLHTTP');
  }
  catch (e){
  	try {
  		xmlhttp = new
  		ActiveXObject('Microsoft.XMLHTTP');
  	}
  	catch (E) {
  		xmlhttp = false;
  	}
  }
  
  if(!xmlhttp && typeof XMLHttpRequest!='undefined'){
  	xmlhttp = new XMLHttpRequest();
  }
  
	xmlhttp.open('GET', file + id, true);
	xmlhttp.onreadystatechange=function(){
	if(xmlhttp.readyState==4){
		var content=xmlhttp.responseText;
		document.getElementById("misto_termin_plavby").innerHTML = content;
	 }
	}
  xmlhttp.send(null)
  return;
}