2002 keyless remote programing

i just bought a 2002 2wd blazer and it came with no remotes. i bought 2 off ebay and need to know how to program them. yes my blazer came with keyless entry.
thanks for your help

welcome to af.
use the instuctions in this thread for programing transmiters;
http://www.automotiveforums.com/vbulletin/showthread.php?t=96957&highlight=keyless+entry+programming.
also, use the search feature in the future before making a new thread. this topic has been covered many times.