[Rails] exiting the function

Hi

I have this code
def destroy
@property = Property.find(params[:id])
IsAuthorized?(@property.user_id)
@property.destroy

respond_to do |format|
format.html { redirect_to(properties_url) }
format.xml { head :ok }
end
end

def IsAuthorized?(id)
if current_user.id!= id
flash[:notice] = 'Not authorized '
redirect_to(properties_url)
end
end

If a not authorized user calls destroy it stills calls
@property.destroy.
How can I prevent the destory function from calling @property.destroy
if the user is not authorized?

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