get value from div in javascript

admin

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i hava a <div>-section in my HTML which I build in a seperate JS-file when loading the page. initially this section is hidden.

when i press button on my HTML-page (actually it is a JSP-page but i think this does not matter) the <div>-section should be visible.
in a "normal" html page (without a frameset) this works fine, i can address my div-section called "working" via:

document.getElementById('working');

as soon as i use a frameset i have no chance to address the element with the code above and i also do not find any method to address my div-section, the following does not work:

parent.mainFrame.document.getElementById('working')

this always brings NULL!!!

any idea how i can address the div-section in my javascript?!

thanks
bernhard
 
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