About: http://webisa.webdatacommons.org/143863470

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	If you put an alert() inside and just below your IF block I think you will find the alert() inside the IF block will never be executed, hence your form is always submitted whether you check any boxes or not.
http://www.w3.org/ns/prov#wasQuotedFrom	sitepoint.com