JQueryUI tabs change tab programatically and focus to the control inside tab

Hello,

I am using tabs from queryui.com/tabs.Tab is working fine.My question is

how to get focus on the mandatory fields(which could be inside the active tab or the next tab)  when it is empty on button click.

If the control is in same tab where the submit button also resides, then there  will be no issue,if it is in another tab then how will we open that particular tab programatically and focus to that control