pop up conformation, php?

[geekyEd]

For a form that I have created, once the submit button has been used I would like for a conformation pop up (in the browser) to to ask if the user would really like to submit the data based on the fact that some of it is missing.

How would I go about doing this in php? can it be done in php?

Thanks in advance

 

[geekyEd]

A text warning before the submit button will have to suffice then.

Thank you