Undefined form value error Netscape

I get an “Undefined form value” error line 4 in netscape.
Works fine in IE.
And suggestions?
Yes there is a form called “form1” in another frame.

<script language=”Javascript”>

parent.score=parseInt((parent.score+<?print $cr;?>)*10);

parent.score=(parent.score)/10;

parent.topFrame.form1.score.value=parent.score;

parent.ida[1]=<?print $id1;?>;

parent.ida[2]=<?print $id2;?>;

parent.url[1]=”<?print $url1;?>”;

parent.mainFrame.location.href=”<?print $url1;?>”;

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