var pnn=(document.layers)?true:false;
var pn6=(navigator.vendor == ("Netscape6") || navigator.product == ("Gecko"));
var pie=false;
var pop=false;
if (document.all){ if (navigator.userAgent.search('Opera')>=0){ pie=false; pop=true;} else {pie=true; pop=false;}}

  function openDiv(name) {

	if(pnn) { document.layers[name].visibility="show"; } 		      else
	if(pie || pop) { document.all[name].style.visibility="visible"; }  else
	if(pn6) { document.getElementById(name).style.visibility="visible"; }

	document.getElementById(name).style.display="block";
  }//openDiv


  function openDiv2(name) {
	window.parent.document.getElementById(name).style.visibility="visible";

	if(pnn) { window.parent.document.layers[name].visibility="show"; } 		      else
	//if(pie || pop) { window.parent.document.all[name].style.visibility="visible"; }  else
	if(pn6) { window.parent.document.getElementById(name).style.visibility="visible"; }

	window.parent.document.getElementById(name).style.display="block";
  }//openDiv2

  function closeDiv(name) {
	document.getElementById(name).style.visibility="hidden";

	if(pnn) { document.layers[name].visibility="hide"; } 		      else
	//if(pie || pop) { document.all[name].style.visibility="hidden"; }  else
	if(pn6) { document.getElementById(name).style.visibility="hidden"; }

	document.getElementById(name).style.display="none";
  }//closeDiv


  function closeDiv2(name) {
	window.parent.document.getElementById(name).style.visibility="hidden";

	if(pnn) { window.parent.document.layers[name].visibility="hide"; } 		      else
	//if(pie || pop) { window.parent.document.all[name].style.visibility="hidden"; }  else
	if(pn6) { window.parent.document.getElementById(name).style.visibility="hidden"; }

	window.parent.document.getElementById(name).style.display="none";
  }//closeDiv



  function csopt() {
  	if(document.getElementById('dk').style.display=="block") closeDiv('dk');
	else openDiv('dk');
  }//csopt



 function checkit() {
 	var email=document.forms['wyslij'].elements['comment[email]'].value;
	var malpa=email.indexOf('@');
	var kropka=email.lastIndexOf('.');

 	var autor=document.wyslij.elements['comment[autor]'].value;
 	var tresc=document.wyslij.elements['comment[tresc]'].value;

  	if( autor == "") {
 		alert("Wpisz swoje imię!  ");
		document.wyslij.elements['comment[autor]'].focus();
		return false;
  	}

  	else if( email == "") {
 		alert("Wpisz swój adres e-mail !  ");
		document.wyslij.elements['comment[email]'].focus();
		return false;
  	}

	else if (malpa<2 || malpa>kropka){
		 alert("Twój adres e-mail jest niepoprawny !  ");
		document.wyslij.elements['comment[email]'].focus();
		 return false;
	}


  	else if( document.wyslij.elements['comment[tresc]'].value == "") {
 		alert("Wpisz treść komentarza !  ");
		document.wyslij.elements['comment[tresc]'].focus();
		return false;
  	}

  document.wyslij.submit();
 }