$.Model.validate(attrNames, validateProc, options)
{Array|String}
Attribute name(s) to to validate
{Function}
Function used to validate each given attribute. Returns true for valid and false otherwise. Function is called in the instance context and takes the value to validate
{Object}
(optional) Options for the validations. Valid options include 'message' and 'testIf'.
Validates each of the specified attributes with the given function. See [validation] for more on validations.