This has nothing to do with any special software. If you had the whole page on your screen and you have been able to fill all the fields than you have Java Enabled in your browser.
If you run Internet Explorer go to
TOOLS
INTERNET OPTIONS
ADVANCED
and scoll down to MICROSOFT VM
check all three items marked with a cross.
In Netscape Navigator it is a similar function where you can adjust your settings, just make sure Java is enabled.
A restart is required to enable the new setting.
To answer some EasyJet problems. We found out today (some netties I chatted with) that there is no problem with the site at all if all pre-written text in the fields is over-written or deleted.
Do not send any of the words mentions in the fields during start of the page.
This obviously produces the problem of rejecting the reply.