check for variable value but need 0 to be good ?

I am checking a field to make sure the user has entered a value but in the situation I have the user can and may need to pick 0 in the drop down which is then treated as no value when checked for a value, is there a way I can get it to treat 0 only has a value and still check for a value as normal ? Any one know ? or have any ideas !! Adrian Smith ------------------------------------------------------ ade@stormbreaker.com ------------------------------------------------------