Form validation question

I'm working on a site where people register and choose their own username.  In the registration form I'd like to, onBlur from the username field, immediately check to see if that username is already in use and if so, trigger an alert that returns them to the field. What's the best way to do this? Thanks in advance for any help. Les

The JQuery Validate plugin has a method whereby, aside from any standard checks you put in place (not empty, alphanumeric only, etc), it will make an Ajax request and assign a field it's validation status based upon the Ajax status return. http://bassistance.de/jquery-plugins/jquery-plugin-validation/ Steve "Cutter" Blades Adobe Certified Professional Advanced Macromedia ColdFusion MX 7 Developer Co-Author of "Learning Ext JS" http://www.packtpub.com/learning-ext-js/book _____________________________ http://blog.cutterscrossing.com On 10/15/2009 2:05 PM, Les Irvin wrote: ----- Excess quoted text cut - see Original Post for more -----