Quite honestly I posted this code because to my knowledge no other solution has been offered to address this besides the java code, and many consider it flaky. This feature was the number 2 request on our Wholesale website, number 1 being a catalog entry module. I put in both of these for the new site, and wanted to share some of what I did for anyone who would like to use it.
Really the idea came from here:
http://forum.x-cart.com/showthread.php?t=31860&highlight=continue+shopping
Matt