Feeling Stupid Again

Errrrgh. I'm trying to get a picture in my profile, but when I go through the rigamarole of Hello and Picasa, copy the url from the post and paste it in my profile, it says there are illegal characters. Who let illegal characters in here? I made sure everyone had their green card when I hired them. Oh, wait. No, that's not what they meant, was it. Anyway, they weren't illegal when they posted on the blog and I copy-n-pasted them into the profile. What gives?