[Javascript] object methods and prototypes

[Mike Dougherty]

Is it better to define an object with method references in the constructor or to assign methods 
using the object.prototype syntax?  (are more resources used for multiple instantiations of 
example 1?)

Assume MyFunction() is already defined earlier:

ex 1:
function MyObj() {
   /* code here */
   this.Method = MyFunction()
   }

ex 2:
function MyObj() {
   /* code here */
   }

   MyObj.prototype.Method = MyFunction()