var frmvalidator = new Validator("form1");

 frmvalidator.setAddnlValidationFunction("DoCustomValidation");
 frmvalidator.addValidation("RegNom","req","All the fields are required!");
 frmvalidator.addValidation("RegCog","req","All the fields are required!");
 frmvalidator.addValidation("RegEma","req","All the fields are required!");
 frmvalidator.addValidation("RegEma","email","Please insert a valid email address!");
 frmvalidator.addValidation("RegPwd","req","All the fields are required!");