IE bug report

A survey form I wrote runs fine of Firefox 1.5.0.9, but MS IE 7.0.5730.11 gives this error message "document.forms.forms.elements" is null or not an object." My file contains:

// Include the extended class.
require_once("example_elements.class.php"); // also has to have apeform.class in the same folder
// Instantiate an object from this class.
$form = new ExtendedApeform();

Did I do somthing wrong?

There are just a few lines of JavaScript in my class to set the input focus to the first form element. I used document.forms[0] before. This may fail if there are other forms in your HTML document. I rewrote the JavaScript part to use more standard compilant methods.