You could use (after several tunnings) the Java Sound API to build an applet. You should also, convince the users to install that extension of the JDK before using your site. And, later, find a way to sync the users voice with the moment when it starts recording it. (for example, displaying some awesome photograph on the screen :) ) . Search at SourceForge's Projects for some JAVA soft to adapt as an applet.- Or just, use some VOIP system that everybody has...