function display (elementID)
{
var id;

if ((ie) &! (opera)) {

      id = "area" + elementID;
      document.all.item(id).style.display = "block";
   }
else {

      id = "area" + elementID;
      document.getElementById(id).style.display = "block";
   }
}
function undisplay (elementID)
{
var id;

if ((ie) &! (opera)) {
	  id = "area" + elementID;
      document.all.item(id).style.display = "none";
   }
else {
	  id = "area" + elementID;
      document.getElementById(id).style.display = "none";
   }
}
// window.onload=undisplay;


ano=0;
		function rozbal()
		{
			objekt=document.getElementById('vrstva');		
			if( !ano ) {objekt.style.visibility='visible';ano=1;}
			else {objekt.style.visibility='hidden';ano=0;}
		}
function popUp(id,on) {
   if (on) {
      document.getElementById(id).style.visibility = 'visible';
   } else {
      document.getElementById(id).style.visibility = 'hidden';
   }
} 
function otevriOkno(url, jmeno, w, h) {  
  popupWin = window.open(url, jmeno, 'resizable=1,top=20,left=20,menubar=0,scrollbars=yes,width=' + w + ',height=' + h);
}
function prn() {
document.write('\074a href=\"javascript:goprn();\"class=\"copyrightstreda\"\076tisknout stránku\074/a\076 ');
}
function goprn() {
	if(window.print) {
		window.print();
	}
	else {
		alert("Stránky jsou připraveny pro tisk.\nNyní múžete zvolit položku Tisk/Print ve Vašem prohlížeči.");
	} 
}
function zpet() {
document.write('\074input type="button" value="Zpět" onclick="history.back()" /\076 ');
}

function showElement(elementName,switchName) {
	if (document.getElementById(switchName).checked) {
		document.getElementById(elementName).style.display = "block";
	}
	if  (document.getElementById(switchName).checked == false) {
		document.getElementById(elementName).style.display = "none";
	}
}
function showInputVal(obj, txt) {
	if(obj.value=='') {
		obj.value=txt;
	}
}

function hideInputVal(obj, txt) {
	if(obj.value==txt) {
		obj.value='';
	}
}