Can anyone help with the gray border on pics?

edit your CSS in line 406 :
delet the color ccc or all the line as in this exemple :

.postContent img {
margin:10px;
}

Just to advice you, try to use Firefox and the Firebug plugin, you well be quickly expert in the editing the websites.

see this video to learn how it work:
https://www.youtube.com/watch?v=RB-CYgBEmRo