vB4 Checking profile fields?
 

I want to add a label in front of the row of instant messaging icons for consistency's sake; we have a number of additional items in the user details and having that row without a label looks odd. I found this line that appears to be generating the links:
Code:
{vb:raw post.icqicon} {vb:raw post.aimicon} {vb:raw post.msnicon} {vb:raw post.yahooicon} {vb:raw post.skypeicon}
And it seems like it should be fairly simple to conditionally add a "Messaging: " text node or span or whatever at the beginning of the line. I just can't figure out what condition to test. Testing for the existence of those variables doesn't work; they're all always strings of non-zero length, regardless of profile settings, from what I've figured out. I can't figure out any way to access the values of those variables directly, so I don't really know how (or even if) they're changing based on the user's profile details; I might be looking in completely the wrong place! Using legacy postbits, if that's relevant.

What am I missing?