It is your job to show him EVERY web site on the internet until he gets the point in his head. If he still believes that he should get what he wants, then tell him it is going to cost him some HEAVY R&D money to figure out the best way to do such a thing.

I can't stand it when people don't stand up for this stuff. These are conventions for a reason. This is something that is built into IE, it isn't something you just change for the hell of it.

Tell him/her that it can't be done without a serious investment of time. Put it in dollar values how much it is going to cost them (like your hours times the amount you make plus how much you make for the company if your time was used elsewhere). This is something that will stop an unreasonable request from happening fast! I do it all the time. I tell people to get used to things that are convention based. If they want other than conventions, I show them how much extra it will cost. They stop there....

Another thing, you can probably do this with javascript, you probably don't need Java, but I don't have any examples for you.