How do you convert it to infra red - Canon PowerShot A495 Digital Camera

Take your camera apart and find the ccd.
it will be under the yellow wiring ribbon like in this picture http://www.ifixit.com/Guide/Disassembling+Canon+Powershot+SD880+Flash/4647/1
remove the ir blocking filter, reassemble the camera check the focusing if no problems your ok, if you get problems then google how to remove ir coating from the glass filter you have just removed then replace it.
I purchased a Canon SX130 IS and did exactly what i have described (no problems with focusing). I use a piece of floppy disk cut to the size of the lens and permanently taped on and i find it yields some awesome results. Google chdk and photoshop ir actions