function show(divid) {
	if (document.getElementById(divid).style.visibility=='visible')
	{
		document.getElementById(divid).style.visibility='hidden';
		document.getElementById(divid).style.display='none';
	}
	else
	{
		document.getElementById(divid).style.visibility='visible';
		document.getElementById(divid).style.display='block';
	}
}
function pokaz(ch) { 
 	obj=document.getElementById('dodatkowe');
	if (ch.checked)
		obj.style.display='block';
	else
		obj.style.display='none';
}
function ukryj(ch) { 
 	obj=document.getElementById('dodatkowe');
	if (ch.checked)
		obj.style.display='none';
	else
		obj.style.display='block';
}

function pokaz1(id) { 
 	obj=document.getElementById(id);
	if (this.checked)
		obj.style.display='none';
	else
		obj.style.display='block';
}
function ukryj1(id) { 
 	obj=document.getElementById(id);
	if (this.checked)
		obj.style.display='block';
	else
		obj.style.display='none';
}

function initLinkedSelect(from,to) {
  var options = new Array();
  (from.style || from).visibility = "visible";
  for (var i=0; i < to.options.length; i++) {
    options[i] = new Array(to.options[i].text,to.options[i].value);     
   } 
  from.onchange = function() {
  var fromCode = from.options[from.selectedIndex].value;
  to.options.length = 0;
  for (i = 0; i < options.length; i++) {
    if (options[i][1].indexOf(fromCode) == 0) {
      to.options[to.options.length] = new Option(options[i][0],options[i][1]);
    }
  } 
  to.options[0].selected = true;
  }
  from.onchange();
  }

function init(){
   var elems1=document.getElementById('wybierzMiasto');
   var elems2=document.getElementById('wybierzNagrode');
   initLinkedSelect(elems1,elems2);
 }