How to get the length of apex_item in javascript?

Hello all
I am having a tabular report using apex_item, I want to know how can i get the length of the item in javascript? like we do in pl/sql using apex_application.g_f01.count().
and one more thing, when I go to certain page, tab of that page is getting disabled, what should I do to make tab available always whether I am on that page or on any other page.
Thanks
Tauceef

Hi Oli
Thanks for replying, In my first question actually I am validating the report values in javascript for that I need the length of the apex_item to run the loop that many times.
Like we can get the length using apex_application.g_f011.count in pl/sql process how to get the length in the javascript, is there a way for that?
I got the answer for the second question, this is the one.
Thanks
Tauceef

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