Text entry fields - regaining focus

Hi all,

I have a technical question regarding text entry fields.....

I have a project whereby a user is required to enter a value (like a password) before going onto the next slide.

When they go to this slide, the text entry field is automatically active so that they can start typing.

BUT... if the user clicks elsewhere on the screen, I have added the functionality whereby an error box appears

stating that they have made an error, in other words they should click on the text entry field in order to start

typing in it etc.

The text field does not become active on it's own after the user has clicked on the wrong part of the screen.

The user might start typing and nothing will happen as they have not clicked on this entry field.

Is there anyway around this?

For example to create some sort of functionality maybe with javascript so that this text entry field becomes

active again and gets it's focus back?

Thanks in advance.

Keith