avatar from profile field

[KrU$ty]

hey all,

Im looking at doing a small mod for my site, and am not quite sure how to go about it.

What i want, is this link:

http://img.eve.is/serv.asp?s=64&c=1108662580

where 1108662580 is a profile field. What i wanted to know was, how would i go about firstly making the link accept the field and secondly, having it replace the user avatars.

Im assuming i would just create a field, add the info to my profile field, and then use <img src="http://img.eve.is/serv.asp?s=64&c=fieldx"> to display (correct me if im wrong). But how would i go about making it so that avatars cannot be chosen and only this automated one will display, as well as where to put the avatar code.

Thanks in advance.