ASP chat,prevent repeat entries

hi there,i run a wap chat site using ASP...i want to make it so that flooding can be possible in my rooms (prevent repeat entries) i simply want somebody to implement some code to prevent repeat entries,how you do this is up to you. thankyou very much ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform sql server 2000, ASP, WAP