function win_open (theurl,wname,nastaveni) {
  window.open(theurl,wname,nastaveni);
}

function win_open_center (theurl,wname,sirka,vyska,nastaveni) {
  wid=document.body.offsetWidth/2;
  hei=document.body.offsetHeight/2;
  lefto=wid-(sirka/2);
  topo=hei-(vyska/2);
  nastaveni="top="+topo+",left="+lefto+",width="+sirka+",height="+vyska+","+nastaveni;
  window.open(theurl,wname,nastaveni);
}

function win_open_full (theurl,wname,nastaveni) {
  wid=document.clientWidth;
  hei=document.clientHeight;
  nastaveni="top=0,left=0,width="+wid+",height="+hei+","+nastaveni;
  window.open(theurl,wname,nastaveni);
}