[tehste]

Originally Posted by BamaStangGuy

Just like the username one. When they enter Internet I want it to automatically tell them not to do so and not let them proceed. Not just when they try to submit it

it can be done with Javascript. AJAX is only for sending/recieving data through streams.
you could have a function on the submit button: onsubmit="checknet"
then in javascript you would have the function:
function checknet(){
formbitvalue = document.theformname.theformfieldname.value;
if (formbitvalue=='Internet'){
alert "Bleugh !!!";
}
}