object.className

/* Example: */
var someObjectsClass = this.className;

object.className

/* Example */

var someObjectsClass = this.className;

http://www.webmasterworld.com/javascript/3090396.htm

One notorious discrepancy between IE and Firefox (or other "good" browsers) is the way they access the class HTML attribute. While I've used more complicated solutions in the past, this simple solution doesn't require any browser detection or even a function to set the class attribute that is used. Click the URL above for an explanation of how it works (see the comment by "penders").

class and className

class, ie

JavaScript