Various controls 'show through' XForms messages, help and hints

IE6 has a bug where certain HTML controls 'show through' any layers that are placed on top of them. For example, a div that is positioned over a drop-box would not be completely visible, since the drop-box itself would show through regardless of the Z-order.

Since formsPlayer uses the HTML drop-box control for xf:select1 then this bug has an impact on forms that show messages, as well as help or hints.

The generally adopted solution to the IE problem is to create an iframe of exactly the same size as the element that needs to be 'on top', and position it behind the element. The iframe hides the drop-box, and in turn, the message, help or hint hides the iframe.

Note that Microsoft have fixed this bug in IE7, so the behaviour described will not affect all forms.