a[href*="usask.ca"]:after {
content: ""
}

 a[href$=".pdf"]:after {
content: " " url("../images/icons/acrobat/acrobat-16.png");
}

a.external:after {
	content: " " url("../images/misc/external_link.png");
}

a[href^="mailto"]:after {
	content: " " url("../images/milky_icons/16/74-2.png");
}

Doesn't work in IE6, so use this to enhance sites rather than use thenm for required information.  Very handy for adding a PDF icon behind a link.  Make icons very small (16px x 16px) and with transparent space on left and top to make it look more aligned with the text.

Automatic icons after specified link type

css, link

CSS