Close window if Javascript Function doesn't exist.

I am opening up a pop up from a page and then from the popup I am calling a javascript function from the opening page. Is there a way to check to see if the function exist and if not, to close the popup without displaying any errors?

I am calling the the funtion from my code behind in the popup window as such:
  RegisterStartupScript("GroupManagement", "<script language='javascript'>window.opener.GroupInfoDDL(); window.focus()</script>")

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

RegisterStartupScript("GroupManagement", "<script language='javascript'>if (window.opener.GroupInfoDDL) {window.opener.GroupInfoDDL(); window.focus()} else {window.close();}</script>")

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
wilcor14Author Commented:
Perfect. Thanks very much. Do you think this will be cross browser compatible? Thanks.
Yes.  I don't think there will be a problem with it, because it doesn't use anything browser specific that I know of.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.