First of all congratulations for your work in SpiderKerala. Try to be little more active to get good results from SPK.
Now coming into your question. As you know how to align images in left and right, it is easy to align images in center. Just replace left or right with center in html tag for aligning images in center.
Aligning images in center does not means that image comes correct in the center of page. It depends on the size of the image. You can use central alignment if you have to place images between two lines or paragraphs.
Forum Editor SPK