a simple plugin with which input fields can be extended so that they show a suggestion part
eg if you try to enter an email address it allows you to suggest the domain name
what you type in:
what you can see and get from the input field:
if you want to do more stuff with the input you can use a function:
if you want to have a more robust responsebility you can add the special input event plugin which uses the new
oninput event and works for old browsers as well.
prefix, something better than keyup