js取得iframe中的表单的表单值

<table width="100%" height="94%" border="0" align="center" cellpadding="0" cellspacing="1"align="left" width="100%" marginwidth="0" height="100%" marginheight="0" scrolling="auto" frameborder="0" id="leftframe" framespacing="0"> </iframe></td>
??? <td width="75%" align="right" width="100%" height="100%" marginwidth="0" marginheight="0" scrolling="auto" frameborder="0" id="leftframe" framespacing="0"> </iframe></td>
? </tr>
</table>

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var items = window.frames['rightFrame'].document.getElementsByName("selectedItems");