get_template_directory_uri

In the event a child theme is being used, the parent theme directory URI will be returned, get_template_directory_uri() should be used for resources that are not intended to be included in/over-ridden by a child theme. Use get_stylesheet_directory_uri() to include resources that are intended to be included in/over-ridden by the Child Theme.

http://codex.wordpress.org/Function_Reference/get_template_directory_uri