The 'Validate Data' module allows a developer to add a validation test function to any input field available on a node or web form. We call these entities or functions "validators". This module helps you by building the java and php code needed to test the input data after it is submitted via a "mouse click out" or "tabbing out" of the input field (if JAVA is enabled). A message is display immediately if the data did not meet the criteria. Additional, if the JAVA is available the save button will be disabled until the faulty fields have been corrected. When the module is enabled a directory (/validate_data) and pair of files are created in the sites "Public file system path". If that directory does not contain a "files" directory a warning message is displayed.