IE, DOM and Select onChange

Hi,

I have a dynamically created combobox(<select> <option>). I need to add an 'onChange' event handler for this.

I have already tried the following, pls see that both the methods work in Mozilla but not in IE -

Code:

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theCombo.setAttribute("onChange", "callOnChange()");

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Code:

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theCombo.onChange = "callOnChange()";
var onChangeHandler = new Function(theCombo.onChange);
if( theCombo.addEventListener )
        theCombo.addEventListener("change", onChangeHandler, false);
else if( theCombo.attachEvent )
        theCombo.attachEvent("onChange", onChangeHandler);

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I kinda need this urgently, pls tell me how to make it work in both Mozilla and IE...
Thanks in advance...