Develop an Ajax Chat program(ibm.com)

http://www.ibm.com/developerworks/library/wa-aj-chat/?S_TACT=105AGX54&S_CMP=C0319&ca=dnw-1011&ca=dth-st&open&cm_mmc=5057-_-n-_-vrm_newsletter-_-10731_108061&cmibm_em=dm:0:6992641