Verify CheckBox BEFORE RECORD UPDATE !!

Hi!

I'm trying to customize the "BEFORE RECORD UPDATED" event (function BeforeEdit)

of on Edit Page to work this way:
if a checkbox in my Edit Page is "checked" <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=11559&image=1&table=forumtopics' class='bbc_emoticon' alt=':unsure:' />

{

1. send an e-mail <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=11559&image=2&table=forumtopics' class='bbc_emoticon' alt=':D' />
   
2. modify some value in the edit page <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=11559&image=3&table=forumtopics' class='bbc_emoticon' alt=':unsure:' />
   
3. update the record with the new values. <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=11559&image=4&table=forumtopics' class='bbc_emoticon' alt=':unsure:' />
   } else {
   
4. update the record with current values in the Edit PAge. <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=11559&image=5&table=forumtopics' class='bbc_emoticon' alt=':unsure:' />
   }
   I'm not sure how to write the if expression and points 2,3 and 4.
   Thanks a lot for your help!!!
   
   Scarpy
   <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=11559&image=6&table=forumtopics' class='bbc_emoticon' alt=':unsure:' />