<script type="text/javascript">
$(document).ready(function() {
function sprawdzenie() {
var login = document.getElementById("login").value;
if($login == '')
{
$('#errorlogin').show();
}
else
{
$('#errorlogin').show();
}
}
});
</script>
{/literal}
<form action="java script:sprawdzenie();" method="post">
<table align="center" style="margin-bottom:10px;">
<tr>
<td>{$registerligin}</td>
<td><input type="text" id="login" name="login"></td>
<div id="errorlogin" style="display:none;">zlylogin</div>
</tr>
<tr>
<td>{$registerhaslo}</td>
<td><input type="password" name="haslo" id="haslo"></td>
<div id="errorhaslo" style="display:none;"></div>
</tr>
<tr>
<td>{$registerpowtorzhaslo}</td>
<td><input type="password" name="powtorzhaslo" id="powtorzhaslo"></td>
<div id="errorpowtorzhaslo" style="display:none;"></div>
</tr>
<tr>
<td>{$registermail}</td>
<td><input type="text" name="mail" id="mail"></td>
<div id="errormail" style="display:none;"></div>
</tr>
<tr>
<td colspan="2" align="center"><input class="button" id="submit" type="submit" value="Zarejestruj"></td>
</tr>
</table>
</form>

Uncaught ReferenceError: sprawdzenie is not defined

if($login == '')

if(login == '')