you dont need to change the products results page for this, go to the products search page.
for Inventory stock, leave the first option (minimum) empty and enter 4 in the Maximum. this will return all products where the inventory is less than 5
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.