Use .aw-image-{name} selector with background:url(...) rule
.aw-image-home {background:url(home.gif) 1px 1px no-repeat}
.aw-image-email {background:url(email.gif) 1px 1px no-repeat}
.aw-image-clock {background:url(clock.gif) 1px 1px no-repeat}
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