var img_okno=0;
var img_oknoa;

function show_image(img_link,sirka,vyska){
  if(img_okno){
    img_okno.close();
  }
  img_x=((screen.width-sirka)/1.8);
  img_y=((screen.height-vyska)/1.8);

  img_okno = window.open(img_link,"img_okno","width="+sirka+",height="+vyska+",left="+
  img_x+",top="+img_y+",toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,dependant=1");
}

function show_image2(img_link,sirka,vyska,oid){
  if(img_oknoa){
    img_oknoa.close();
  }
  img_x=((screen.width-sirka)/1.8);
  img_y=((screen.height-vyska)/1.8);

  img_oknoa = window.open(img_link,"img_okno"+oid,"width="+sirka+",height="+vyska+",left="+
  img_x+",top="+img_y+",toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,dependant=1");
}