/*
 * Adds onfocus, onblur events to navigation menu links
 * Needed because IE is a crappy, non-standards-compliant browser
 * This javascript is required for menu keyboard accessibility in IE
 */

sfFocus = function() {
	// grab all the links from header-nav
	var sfEls = document.getElementById("header-nav").getElementsByTagName("A");
	// set up onfocus and onblur events for menu elements
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onfocus=function() {
			this.className+=(this.className.length>0? " ": "") + "sffocus";
			this.parentNode.className+=(this.parentNode.className.length>0? " ": "") + "sfhover";
			if(this.parentNode.parentNode.parentNode.nodeName == "LI") {
				this.parentNode.parentNode.parentNode.className+=(this.parentNode.parentNode.parentNode.className.length>0? " ": "") + "sfhover";
				if(this.parentNode.parentNode.parentNode.parentNode.parentNode.nodeName == "LI") {
					this.parentNode.parentNode.parentNode.parentNode.parentNode.className+=(this.parentNode.parentNode.parentNode.parentNode.parentNode.className.length>0? " ": "") + "sfhover";
				}
			}
		}
		sfEls[i].onblur=function() {
			this.className=this.className.replace(new RegExp("( ?|^)sffocus\\b"), "");
			this.parentNode.className=this.parentNode.className.replace(new RegExp("( ?|^)sfhover\\b"), "");
			if(this.parentNode.parentNode.parentNode.nodeName == "LI") {
				this.parentNode.parentNode.parentNode.className=this.parentNode.parentNode.parentNode.className.replace(new RegExp("( ?|^)sfhover\\b"), "");
				if(this.parentNode.parentNode.parentNode.parentNode.parentNode.nodeName == "LI") {
					this.parentNode.parentNode.parentNode.parentNode.parentNode.className=this.parentNode.parentNode.parentNode.parentNode.parentNode.className.replace(new RegExp("( ?|^)sfhover\\b"), "");
				}
			}
		}
	}
}