function mutat(subject)
  {
  if(document.getElementById(subject).style.display=='none') { document.getElementById(subject).style.display=''; }
 }
 function rejt(subject)
  {
  if(document.getElementById(subject).style.display=='') { document.getElementById(subject).style.display='none'; }
 }
  
 function load(url,place) {
document.getElementById(place).innerHTML = "<div style=\"text-align:center;font-family: Calibri; font-size:12px; font-weight:bold; margin-top:100px;;\">Betöltés...<br><img src=ajax-loader.gif></div>";
 var req = null;
 if (window.XMLHttpRequest)
  req = new XMLHttpRequest()
 else
  if (window.ActiveXObject) req = new ActiveXObject("Microsoft.XMLHTTP");

 req.onreadystatechange = function() {
  if (req.readyState == 4)
   if (req.status == 200)
    document.getElementById(place).innerHTML = req.responseText;
   else
    document.getElementById(place).innerHTML = "AJAX error.";
 } 
 req.open("GET", url, true); 
 req.send(null);
}

function mailcheck() {
var x = document.uzen.emil.value;
var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
if (document.uzen.nev.value == "")
          { alert("Nem adott meg nevet!"); document.uzen.nev.focus(); return false; }
if (document.uzen.emil.value == "")
          { alert("Nem adott meg E-mail címet!"); document.uzen.emil.focus(); return false; }
if (!filter.test(x))  { alert('A megadott E-mailcím hibás!');document.uzen.emil.focus(); return false; }
	
if (document.uzen.uzenet.value =='')
          { alert("Az üzenet szövege hiányzik!"); document.uzen.uzenet.focus(); return false; }		   
 else { return true; }
}

 var ScreenResolution = screen.width + "x" + screen.height;