Script Execution via URL

Hi everybody, i wrote a script which will be executed by HREF's. If a command is going to be executed by a click on a link the page reloads itself and jumps in the part of the script, which should be executed. Normaly I wrote some like this for doing this: echo '<a href="'.$PHP_SELF.'?action=delete&id='.$arrResult['id'].'" class="text01">'; but now in a very special case i forgot to write $PHP_SELF like this <a href="?action=delete&id='.$arrResult['id'].'" class="text01"> without knowing that I have forgotten to write this $PHP_SELF thing I clicked on the Link and i did execute the Script, like i wanted it to. Is it normal that it works so fine? Can I use this everytime I link on the same page for script execusion? Can I send Forms via an PHP Function like the submit() statement in Javascript? Have a nice day, and please answer. Sascha Braun