<script>
function aktywuj6()
{
document.forms['naz'].nazwa6.disabled = false;
}
</SCRIPT>

<div id="identyfikator">
<form name="naz">
<p align="left">
<input style="padding: 4px; width: 660px; font-weight: bold; text-align:left; padding-left: 10px;"  type="button" name="naz" value="ab ab ab + ab ab ab" onclick="document.getElementById('naz').style.display = this.onclick ? 'block' : 'none' " /></p>

<div id="naz" style="display: none;margin-left: 3px;margin-top: -40px; background: #eeeeee;;padding: 30px 5px 10px 10px; width: 635px; border: 1px solid #727272; font-size: 12px;">

<form name="t2">
<p><strong>dasdasdasdasdas</strong></p>

<a href="http://www.wp.pl"   target="blank"><input style="padding: 10px;" type="button" value="Zobacz" onClick="aktywuj6()"></a>

<p align="left"><input type="checkbox" name="nazwa6" value="wartość" onclick="document.getElementById('t2').style.display = this.checked ? 'block' : 'none'; this.form.elements['nazwa2'].disabled = !this.checked" disabled="disabled" /><strong>Potwierdzam!</strong></p>

<div id="t2" style="display: none">
Kliknij niżej aby zakończyć!
<input style="padding: 4px; width: 100%; font-weight: bold; text-align:center; padding-left: 10px;" type="button" name="aa" value="Zakończ!" onclick="document.getElementById('identyfikator').style.display = this.onclick ? 'none' : 'block'; this.form.elements['nazwa2'].disabled = this.form.elements['nazwa3'].disabled = this.checked" />

</div>
</form>
</div></form>
</div>