How to obtain value from window.opener

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Javascript

Hi,

I am creating a Help window using .aspx page.

On button click i am openning that window, by calling following code.

winref = window.showModalDialog("HelpWindow.aspx?" + QueryStr, "HLP", strHelp);

while openning this window, i am also sending Parent form control id, that control can be textbox or label.

That window consist of certain number of fields. on selection of these any of fields , i want to assaign selected value to my parent form control.

i used following code for this

eval('window.opener.document.getElementById('CtrlName').value="' + AsgnText + '"')

But window.opener not able to find that CtrlName or not getting that control.

Using window.open() method, this can be achived but i need to perform this task using

window.showModalDialog

()

can any body suggest, what to do???

thanks in advance