jQuery(document).ready(function(){
                // binds form submission and fields to the validation engine
                jQuery("#formID").validationEngine();
            });
            
            /**
             *
             * @param {jqObject} the field where the validation applies
             * @param {Array[String]} validation rules for this field
             * @param {int} rule index
             * @param {Map} form options
             * @return an error string if validation failed
             */
            function checkHELLO(field, rules, i, options){
                if (field.val() != "HELLO") {
                    // this allows to use i18 for the error msgs
                    return options.allrules.validate2fields.alertText;
                }
            }

            function field1_or_field2_or_field3(field, rules, i, options) {
                if (
                    ($("#field1").val() == "") &&
                    ($("#field2").val() == "") &&
                    ($("#field3").val() == "")
                ) {
                    return "At least one field is required";
                } else {
                    jQuery("#formID").validationEngine("closePrompt", $($("#field1").get(0)));
                    jQuery("#formID").validationEngine("closePrompt", $($("#field2").get(0)));
                    jQuery("#formID").validationEngine("closePrompt", $($("#field3").get(0)));
                }
            }