JavaScript Validation

I've spent some time writing a validation framework for checking user text field inputs on the client-side.

The parameters it takes are:
function(valField, type, options) where valField and type are required. valField is the element to validate, and type is a choice of ["required", "exists", "update", "password"].
Options is optional and is an object. In the options object, it takes these attributes:

infoField: element - the element to display messages to the user,
repeatField: element - the element which is used to repeat (like repeat password or email),
required: boolean - specifies whether input is required (defaults to true),
ajax: boolean - specifies whether Ajax is used to communicate to the server (defaults to false),
url: string - url for Ajax call (only works if ajax: true),
column: string - the column in the table (only works if ajax: true),
idkey: string - the id parameter (only works if ajax: true)

Examples of different types of usage:

• new Validator(this, 'exists', { infoField: $('project_name_span'), ajax: true, idkey: $('user_id').value , column: 'name', url: '/project/check_exists' });
• new Validator(this, 'required', { infoField: $('project_name_span') });
• new Validator(this, 'update', { infoField: $('user_lname_span'), ajax: true, column: 'lname', idkey: $('user_id').value, url: '/user/ajax_update' });
• new Validator(this, 'password', { infoField: $('user_pwd_span') });