var zoomfactor=10;
var vyb=0;
var tik;
var imgw=250;
var imgwmax=imgw*2;
var imgwidth=imgw;
var imgleft=500-imgw;

function actMapa(){
  document.write('<a href="mapa/" onclick="openMapa(); return false;"><img id="mapa" src="'+imgsrc+'" alt="PZO - mapa" style="width:'+imgw+'px; left:'+imgleft+'px;"><\/a>');
}
function openMapa(){
  if (vyb>0){
    window.clearInterval(tik);
    imgwidth=imgw;
    document.getElementById("mapa").style.left=imgleft+"px";
    document.getElementById("mapa").style.width=imgw+"px";
    if (vyb==1){vyb=0; return;}
  }
  vyb=1;
  tik=window.setInterval("zoomplus()", 1);
}
function zoomplus(){
  if (imgwidth<imgwmax){
    imgwidth +=zoomfactor;
    novaleft=imgleft-(imgwidth-imgw);
    document.getElementById("mapa").style.left=novaleft+"px";
    document.getElementById("mapa").style.width=imgwidth+"px";
  }
  else {window.clearInterval(tik);}
}