function zmen_stoly(img_id){
  document.getElementById("img_var").src="images/stoly_var_"+img_id+".gif";
  document.getElementById("img_var").alt="rozestavení stolů - varianta "+img_id;
  document.getElementById("img_var").style.display="";
}
function zobraz_stoly(typ_rezervace){
  if(typ_rezervace == 1){
    document.getElementById("radek_rozestaveni").style.display="none";
    document.getElementById("img_var").style.display="none";
  }else{
    document.getElementById("radek_rozestaveni").style.display="";
  }
}