Zapatec DHTML Form Widget - Display field errors using custom function

This demo uses the winxp theme.
If showErrors contains reference to JavaScript function - this function will be used to display error message for given field.
Function receives reference to field DOM element as first argument and error message as second argument.
If second argument is not specified - this means that field is valid. You can use this to hide error message from page.
In current demo error message is displayed inside DIV element. This element is hidden if field is valid.