[HTML] pobierz, plaintext 
<script language="javascript">
 var ile = 0;
 
 function il()
 {
     ile++;
     document.write(ile); 
 }
</script>
<input type="checkbox" name="aa" onclick="il()">
[HTML] pobierz, plaintext 

[HTML] pobierz, plaintext 
<input type="checkbox" name="aa" onclick="il('kliks')"><br>
    Kliknięcia: <span id="kliks">0</span>
[HTML] pobierz, plaintext