One of the problems in your code is that this JavaScript

window.document.formname.fieldname.value = 5;
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needs to be translated to this PerlScript:

$window->{document}->{formname}->{fieldname}->{value} = 5;
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Notice the curlies! The second problem is that JavaScript looks for objects in more places. Eg. It's OK to write the code above like this:

document.formname.fieldname.value = 5;
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since JavaScript searches through the properties of the active window object if it doesn't find a variable of that name. OTOH

$document->{frm2}->{code}->{value} = 5;
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is not valid.

Likewise if I add <div id="foo" name="this is foo">Ahoj</div> into the page and run alert(foo) in JavaScript I get [object]. If I try to run alert($foo); in PerlScript I get nothing. I bet there is a way to get that object, but I don't know how.

Edit by castaway: Closed small tag in signature