Calling a function in an iframe

I have an upload script that loads into an iframe(‘upload’) within an iframe(‘content’);

It passes a user entered value to a function uploaded() in ‘content’ as follows;

top.content.uploaded(value);

This works just fine in all major browsers.

However, I needed to assign the iframe called ‘content’ a dynamically generated name, so it might now be called, say, ‘content12345’. I store the ‘12345’ value in a hidden input field in the top document so that it can be referenced from any iframe.

I thought this should work…

csx = top.document.getElementById(‘csx’).value;
contentid = “top.content” + csx;
contentid.uploaded(value);

…but it genereates an error “top.contentid is undefined”. Note that it collects the value of csx correctly.

How do I dynamically name the iframe reference within the javascript and call a function within that iframe?

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