function click(e) {
  if (document.all) {
  if (event.button == 2 || event.button == 3) { oncontextmenu = "return false"; } }
  if (document.layers) {
   if (e.which == 3) { oncontextmenu = "return false"; } } }
if (document.layers) { document.captureEvents(Event.MOUSEDOWN); }
document.onmousedown = click;
document.oncontextmenu = new Function("return false;");



    var elementId = 'wrapper';
    var screenWidth = 0, screenHeight = 0;
    var elementWidth = 0, elementHeight = 0;
    var elementLeft = 0, elementTop = 0;

    function screenSize() {
      if (typeof(window.innerWidth) == 'number') {
        screenWidth = window.innerWidth;
        screenHeight = window.innerHeight;
      } else if (document.documentElement &&
                 (document.documentElement.clientWidth ||
                  document.documentElement.clientHeight)) {
          screenWidth = document.documentElement.clientWidth;
          screenHeight = document.documentElement.clientHeight;
      } else if (document.body &&
                 (document.body.clientWidth ||
                  document.body.clientHeight)) {
          screenWidth = document.body.clientWidth;
          screenHeight = document.body.clientHeight;
      }
    }

    function setSize(width, height) {
      if (element = document.getElementById(elementId)) {
        elementWidth = width;
        elementHeight = height;
        element.style.width = width + 'px';
        element.style.height = height + 'px';
      }
    }

    function setCenter() {
      if (element = document.getElementById(elementId)) {
        elementLeft = Math.round(screenWidth / 2 - elementWidth / 2);
        elementTop = Math.round(screenHeight / 2 - elementHeight / 2);
        element.style.left = elementLeft + "px";
        element.style.top = elementTop + "px";
      }
    }

    function init() {
      screenSize();
      setCenter();
    }


    window.onresize = setCenter;
	
	
	
function burkolat_link()
{
document.getElementById("burkolat").style.display = "";
}
function burkolat_link2()
{
document.getElementById("burkolat").style.display = "none";
}

function szaniter_link()
{
document.getElementById("szaniter").style.display = "";
}
function szaniter_link2()
{
document.getElementById("szaniter").style.display = "none";
}

function csaptelep_link()
{
document.getElementById("csaptelep").style.display = "";
}
function csaptelep_link2()
{
document.getElementById("csaptelep").style.display = "none";
}

function kiegeszito_link()
{
document.getElementById("kiegeszito").style.display = "";
}
function kiegeszito_link2()
{
document.getElementById("kiegeszito").style.display = "none";
}