how to show validation error msg of model in html area

Hi I m new to ROR

I have some validation that I'm doing in a model.
for example ---->
class Book < ActiveRecord::Base
  belongs_to :subject
  validates_presence_of :title, :message=>"Error Message"
  validates_numericality_of :price, :message=>"Error Message"

Now i want to show this error message in html area when title is empty
or when user puts price not a numeric???

Help meeee....................