function ukaz(id) {
	document.getElementById(id).style.display='block';
}

function prepnicss() {
   if (!document.styleSheets[0].disabled) {
      document.styleSheets[0].disabled = true;
      document.styleSheets[1].disabled = true;
      document.styleSheets[2].disabled = true;
      document.getElementById("tiskarna").media = "all";
   }
   else {
      document.styleSheets[0].disabled = false;
      document.getElementById("tiskarna").media = "print";
   }
}