set focus on textbox if regularexpression validator fired

[prp]

hi all,
I have a problem.Suppose I use a regularexpression validator for zip code. An User fill wrong entry in the relevant textbox then regularexpression validator fires.but user did not correct the entry and press the signup button . At that time i want setfocus on that zip textbox.
all such things happen in asp.net and i want javascript for the setfocus.

[kenobewan]

Here is an article that may help:
Combine RegularExpression Validation Control with RequiredField Validation Control