Hi,
I don't suggest changing the files insideof /Data/style/common. These files will be overwritten by upgrades.
To change the images in the FAQ template you should create your own CSS rules to override the rules from /data/style/common/style.css. For instance, adding this to the style.css file in your skin directory will override the images:
.faqs dt {
background: url('question.png') no-repeat scroll 0 0 transparent;
}
.faqs dd {
background: url('answer.png') no-repeat scroll 0 0 transparent;
}
For the above to work, you would need files named question.png and answer.png in your skin directory.
HTH,
Joe D.