ImageReady ISSUES!!!

OK, so i've searched and searched and SEARCHED for help on this little problem I have. I want to make animated icons using ImageReady. Maybe I was mistaken, but I thought I could. But every time I try,

I open my first file, which I want to be the first image in the icon:
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THEN I open my second image:
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and THIS happens:
Image hosted by Photobucket.com

I can NEVER get a second image! and when I do, it's just a duplicate of the first! This is seriously driving me nuts! Does ANYONE know what I'm doing wrong??? Any help is MUCH appretiated!