Max-width / max-height in IE

IE does not play nice with max-width and max-height. Here's how to handle it...

/* real browsers */
max-width: 500px;
max-height: 500px;

/* IE */
width: expression(this.width > 499 ? "500px" : "auto");
height: expression(this.height > 499 ? "500px" : "auto");