First, I would put a JS warning in your (documentary) .ready function to make sure the code got right (jQuery links, JS syntax is ok). Also, check by adding a clock to Mozilla Firebug (or another JS debugger) that jQuery picks objects correctly ("img1", "img2").
You can also try simply adjusting the img style to display: none in the markup if it always hides when the page loads every time.
those.
<img src="imgs/image.jpg" style="display:none"></img>
the above logic can be ported to CSS.
Then just use the animate () function when they should show the images.
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