URL object chooser

Try these example URLs:
Image: http://www.concord.org/images/logos/cc/software-logo.png
Model: http://www.concord.org/~sfentress/Clouds_files/Java/Drop4-Test.cml
NLogo1: http://www.concord.org/~sfentress/NetLogo_files/greenhouse.nlogo
NLogo2: http://www.concord.org/~sfentress/NetLogo_files/sheep-selection.nlogo