Declaring errors

Hey, everyone. I'm need to differentiate between #DIV/0! errors and other errors on a regular basis. Since there is no function comparable to ISNA(), I've put together a simple UDF to serve my purpose. Here's what my ISDIV0() function looks like:

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If I point this at a cell with a #DIV/0! error, then I get a #VALUE! error. However, if I point it at a cell in which I've typed #DIV/0!, then it works perfectly. All I can figure is that errors cannot be manipulated as strings.

Can anyone help me figure out how to properly pass the error into my function? I tried digging through excel VBA object editor to see how ISNA() works, but I can't get down to the actual code.

Thanks!

Does anyone know if taking he value of the cell as text as they did here:

http://www.excelforum.com/showthread.php?t=611166

would work?