Okay...so, the post yesterday was clearly not as researched as it should have been. It's true...the Click() event does NOT work in FF...so, the solution I had to utilize the click event had a rather short lifespan. I tried to dynamically add the __onPostBack javascript event onKeyPress as well as onkeydown - to no avail. I'm not sure why it wouldn't work...but, it just wouldn't. (I'm using an image button, .NET 3.5, a lot of JS & AJAX on the page - not sure what, if any of that muddies the waters)...