Pastable version of Login / Registration - be easier?

<pre class='prettyprint' language='php'>&lt;?php
ob_start();
include_once &quot;include/config.php&quot;;

$login = safe_chars($login);
$pass = safe_chars($pass);

if($action == &quot;register&quot;) {

if($login == '') $error = &quot;Nie podano loginu&quot;;

else if(!ereg(&quot;^[a-z0-9_\-]+$&quot;, $login)) $error = &quot;Niepoprawny login&quot;;

else if(strlen($login) &lt;= 2) $error = &quot;Ten login jest za krÃ³tki&quot;;

else if(mysql_num_rows(mysql_query(&quot;SELECT `login` FROM `users` WHERE `login`='$login' LIMIT 1&quot;)) == 1) $error = &quot;Ten login jest zajÄ™ty&quot;;
		
	else if($pass == '') $error = &quot;Nie podano hasÅ‚a&quot;;
	else if($repass == '') $error = &quot;Nie podano ponownie hasÅ‚a&quot;;
		
	else if($pass != $repass) $error = &quot;Musisz wpisaÄ‡ identyczne hasÅ‚a&quot;;

else if($mail == '') $error = &quot;Nie podano adresu e-mail&quot;;
		
	else if(!eregi(&quot;^[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)*@([a-zA-Z0-9_-]+)(\.[a-zA-Z0-9_-]+)*(\.[a-zA-Z]{2,4})$&quot;, $mail))
	$error = &quot;Musisz wpisaÄ‡ prawidÅ‚owy adres e-mail&quot;;
	
	else {
			mysql_query(&quot;INSERT INTO `users` SET `login`='$login', `pass`='&quot;.md5($pass).&quot;', `mail`='$mail', `ip`='$ip', `reg_date`=NOW()&quot;);
	}
}

else if($action == &quot;login&quot;) {

if(mysql_num_rows(mysql_query(&quot;SELECT `login`, `pass` FROM `users` WHERE `login`='$login' AND `pass`='&quot;.md5($pass).&quot;' LIMIT 1&quot;)) == 0)
	$error = &quot;Niepoprawne dane&quot;;
	
	else {
			mysql_query(&quot;UPDATE `users` SET `ip`='$ip', `last_login`=NOW() WHERE `login`='$login'&quot;);
			$logged = 1;
	}
}

else if($action == &quot;logout&quot;) {
	
	$logged = 0;
	header(&quot;Location: /&quot;);
	
}

else {
?&gt;
&lt;style type=&quot;text/css&quot;&gt;
td {
	color: #808080;
	width: 150px;
}

span#error_msg {
	font-weight: bold;
	text-align: right;
	float: right;
	color: #ccc;
}
&lt;/style&gt;

&lt;form action=&quot;#&quot; id=&quot;form&quot; method=&quot;post&quot; onsubmit=&quot;loginRegister(); return false;&quot;&gt;
&lt;input type=&quot;hidden&quot; id=&quot;action&quot; value=&quot;login&quot; /&gt;
&lt;p&gt;Zaloguj siÄ™ lub
&lt;a href=&quot;#&quot; onclick=&quot;switchAction()&quot;&gt;zarejestruj&lt;/a&gt;&lt;/p&gt;
&lt;br/&gt;

&lt;table&gt;
&lt;tr&gt;
	&lt;td&gt;LOGIN&lt;/td&gt;
	&lt;td&gt;&lt;input type=&quot;text&quot; id=&quot;login&quot; maxlength=&quot;15&quot; /&gt;&lt;/td&gt;
&lt;/tr&gt;

&lt;tr&gt;
	&lt;td&gt;HASÅO&lt;/td&gt;
	&lt;td&gt;&lt;input type=&quot;password&quot; id=&quot;pass&quot; /&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;

&lt;div id=&quot;register&quot; style=&quot;display: none;&quot;&gt;
&lt;table&gt;
&lt;tr&gt;
	&lt;td&gt;POWTÃ“RZ HASÅO&lt;/td&gt;
	&lt;td&gt;&lt;input type=&quot;password&quot; id=&quot;repass&quot; /&gt;&lt;/td&gt;
&lt;/tr&gt;

&lt;tr&gt;
	&lt;td&gt;EMAIL&lt;/td&gt;
	&lt;td&gt;&lt;input type=&quot;text&quot; id=&quot;mail&quot; maxlength=&quot;40&quot; /&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;
&lt;/div&gt;

&lt;p&gt;&lt;span id=&quot;error_msg&quot;&gt;&lt;/span&gt;&lt;br/&gt;
&lt;br/&gt;&lt;input type=&quot;submit&quot; onclick=&quot;loginRegister(); return false;&quot; value=&quot;OK&quot; /&gt;&lt;/p&gt;
&lt;/table&gt;
&lt;/form&gt;
&lt;? }
if(isset($error)) print $error;
else print true;
?&gt;</pre>
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Pastable version of Login / Registration - be easier?