jQuery Validation plugin - Custom message -

i new jquery , using jquery validation plugin.

i ask, how override default messages display text in label associated form element.

i message this:

field password required. instead of default this field required.

field postcode must contain @ least 3 characters. instead of default please enter @ least 3 characters.

i need override default behaviour of plugin, because not want specify custom message each item every type of validation.

is possible?

$("#signupform")     .validate({         rules: {             password: "required",             postcode: {                 required: true,                 minlength: 3             }         },         messages: {             password: "field password required",             postcode: {                 required: "field postcode required",                 minlength: "field postcode must contain @ least 3 characters"              }     });