Poor quality pictures when taken inside of school gymnasium

The problem you face is that shooting good photos "inside a school" is a very difficult situation due to the low light. Your eyes can adjust to the low light, but there is only so much a camera can do to get good photos in a low light situation. The IXUS doesn't have a very fast lens or high ISO, so when you get into low light it has to use a slow shutter, which often means blurry images.

First, make sure the camera is shooting with the highest ISO settings. You will find the instructions on page 64 of your manual, and can also read them online here.

Second, use a tripod to stabalize the camera to minimize blur from camera shake.

Finally, if neither of these work then you will need to use a camera with better low-light capabilities, such as the Canon Powershot SX10 IS.