change:
var Registration_group_1_Confirm_Spry = new Spry.Widget.ValidationTextField("Registration_group_1_Confirm_Spry", "undefined", { isConfirm:true , validateOn:["blur"]});
to:
var Registration_group_1_Confirm_Spry = new Spry.Widget.ValidationTextField("Registration_group_1_Confirm_Spry", "none", { isConfirm:true , validateOn:["blur"]});