attached pic sizing

As i go thru the posts there are so many pics that are to small to make out the detail the poster or reader can not pick out. What methods can be used to blow these up for a better look. I would guess I would have to copy then use a program to blow it up? Was just wondering how others view pics ?
Thanks Rod

Ctrl + should increment the size of the image larger in MS Internet Explorer (along with the rest of the page). Ctrl - increments down. Same as using View and Zoom in the Menu Bar.