[jQuery] different lengths by IE and ff

Hi,
I have a dropdown which diplays a companyname with 4 hidden inputs.
these hidden input values are set in text boxes on selected index
change of dropdown.
like this
var sourcedropdown = $(e.target).parent().parent().children(":nth-
child(7)").children().eq(0);
$(sourcedropdown).append($('<option></option>').val(val).html
(sourcename).addClass('selectedval'+val));
var priceval=text[1];
$.each(priceval,function(leftval,rightval){

$(sourcedropdown).append($('<input type="hidden" id="hid'+leftval
+' />').val(rightval));

});

but when i change the selected value in dropdown, I expect 4 as the
length of inputs, firefox shows 4 in alert but IE shows zero.

var sourcedd=$(e.target).parent().parent().children(":nth-child
(7)").children().eq(0);
$(sourcedd).change(function(){

var hiddenchildrens=$(this).children
("input:hidden");
alert(hiddenchildrens.length);
});
}
should i append the hidden inputs in some other way ?

thanx,