Library pathfinders are a time-tested method of leading library users to important resources. However, paper-based pathfinders suffer from space limitations, and both paper-based and Web-based pathfinders require frequent updates to keep up with new library acquisitions. This article details a step-by-step method to create an online dynamic pathfinder with a clean, intuitive interface that performs predetermined searches in online library catalogs. This tool leads users to resources much as a traditional pathfinder does, but it is always up-to-date, requires almost no maintenance, and familiarizes patrons with the library's catalog as they use it. This article requires a basic knowledge of HTML. PHP and JavaScript are also used. While knowledge of these languages is helpful, these parts of the dynamic pathfinder are described in enough detail that no prior knowledge is required. (Contains 2 figures.)