Programmatically moving an image atop another image

I would like to figure out how to programmatically move the bear face and popsicle stick horizontally 1/28th of the way for each day of the month. I need to do thi开发者_开发知识库s for charts ranging from 25 to 35 days in which the face would have to move 1/25th to 1/35th of the way each day, respectively. The reason for not doing this manually is that I'm trying to pull a different bear face each day from a database. Not sure how to attack this.

Bear Chart

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this will depend on the language, but you will want some sort of image processing library.

Say, if you use PHP, then GD is a good start.

In Python, look at PIL.

In Ruby, there is RMagick.

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You can overlay one image over another using plain CSS