Hello there, There are two reasons why you are on this page, one is that you like to go through Force.com blogs and gain as much knowledge as you can. Its a good thing, only you won't gain any knowledge reading the blogs but by digging. Two, you are highly frustrated and have Googled extensively for keywords 'ActionSupport', 'Lookup' and 'Visualforce' for many hours and before that were struggling with ActionSupport, onblur, onChange and other events. If you are here for second reason, we both sail in the same ship and even though I may sound like a telemarketer who is keen on wasting your time, I however, would like to inform you that I am sympathetic towards you. After having struggling to get this thing work on a Lookup for a long time, I decided to embark on the journey that took me back in time even before Salesforce.com existed. I went to the very depths of DOM and source code. Right to the birth place... ok not really, but I am just back from Star