I assume you are viewing the pikkie in picture and fax viewer?
If you were using a graphics prog ... such as paintshop pro ... you could open two (or more) pikkies and then use you could wither drag the open windows arround to where yoe want them 0r use window | arrange or cascade to arrange them neatly
if you don't have such a prog
download irfanView (it's free)
http://www.irfanview.com/
that way (as peanut says) by using windows pikkie viewer and irfanview side by side .... you get what you want
also look at the "create panorama" option in irfanview to show two images side by side!