window.opener.document["nameForm"].getElementById("someid").value; doesnt work

[drpompeii]

Hello guys

i really need your help

i have a popup window, then when i finished (pressing submit button) call onSubmit
method of the form and then call some method in javascript (the js file is an external file) and use some sentence how this

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window.opener.document["nameForm"].getElementById("someid").value;

well this doesnt work
now if the element is a textinput how

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<input type="text" name="somename" value=""  id="someid"/>

i can use this to avoid the problem

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window.opener.document["nameForm"].somename.value;

now the problem is this

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<span name="othersomename" id="othersomenid" style="display:none;">
    <h1>some data</h1>
                ...
</span>

with span the name property is ignored
so if i use this

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    window.opener.document["nameForm"].othersomename.style.display="";

i recive the error message
window.opener.document.nameForm.othersomename has no properties
or

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window.opener.document["nameForm"].getElementById("othersomenid").style.display="";

i recive this error message:
window.opener.document.nameForm.getElementById is not a function


pls, how i can resolve this???

thanks so much for advanced

BTW : i am using firefox 1.5.0.9 in linux