setNumericPageImageUrl()
public method
This is actually a template for generating a set of URLs corresponding to numeric button 1, 2, 3, .., etc.
Use {0} as the placeholder for the numbers.
For example, the image URL http://example.com/images/button{0}.gif
will be replaced as http://example.com/images/button1.gif, http://example.com/images/button2.gif, etc.
