def lookupFieldIDByName( fieldName, dbid=nil )
      getSchema(dbid) if dbid
      ret = nil
      if @fields
         @fields.each_element_with_attribute( "id" ){ |f|
            if f.name == "field" and f.elements[ "label" ].text.downcase == fieldName.downcase
               ret = f.attributes[ "id" ].dup 
               break
            end
         }
      end
      ret
    end
def lookupFieldIDByName( fieldName, dbid=nil )
      getSchema(dbid) if dbid
      ret = nil
      if @fields
         @fields.each_element_with_attribute( "id" ){ |f|
            if f.name == "field" and f.elements[ "label" ].text.downcase == fieldName.downcase
               ret = f.attributes[ "id" ].dup 
               break
            end
         }
      end
      ret
    end
Gets the ID for a field using the QuickBase field label.
 getSchema() or doQuery()  should be called before this if you don't supply the dbid.