[jQuery] Problema with class attribute in jQuery 1.3.1

[AndreMiranda]

Hi everyone!!

I have one checkbox named 'selectAll' that when it's clicked, it
checks all checkbox below it. And these checkboxes have the same class
attribute. Like this:

$("#selectAll").click(function() {
            if ($(this).is(":checked"))
                $(".chkConv").each(function() { this.checked =
true; });
            else
                $(".chkConv").each(function() { this.checked =
false; });
        });

This used to work just fine in 1.2.6. I've tried run it in 1.3.1, but
it doesn't work... just the FIRST checkbox with class attribute
"chkConv" is checked and the other ones remain unchecked.

Does anyone know why this is happening in this new version of jQuery??

Thanks in advance!!