Here’s a solution I found. You add a class to your CSS, e.g.
.rotateimg180 {
-webkit-transform:rotate(180deg);
-moz-transform: rotate(180deg);
-ms-transform: rotate(180deg);
-o-transform: rotate(180deg);
transform: rotate(180deg);
}
(Or 90 or 270… This should ensure it works in all browsers.)
Then enter the image with HTML, e.g.
<img class="rotateimg180" src="whatever" alt="" />
If you know of a neater solution please let me know.