var interval="";
var pos = 0;
var headingWidth = 980;

function leadinInit() {
	var leadinHeadings = dojo.query(".topHeading");
	var menuNodes = dojo.query(".shelfTab");
	interval = setInterval(function() { cycleLeadin(menuNodes, leadinHeadings) }, 9000);
}
function cycleLeadin(menuNodes, leadinHeadings, evt) {
	var currentIndex = dojo.query(".shelfTab").map(function(n){ return n.className }).indexOf("shelfTab shelfTabSelected");
	currentIndex = currentIndex==-1 ? 0 : currentIndex;
	if(currentIndex == 2) {
		newIndex = 0;
	} else {
		newIndex = currentIndex+1;
	}
	dojo.removeClass(menuNodes[currentIndex], "shelfTabSelected");
	dojo.addClass(menuNodes[newIndex], "shelfTabSelected");
	  dojo.fadeIn({
         node: leadinHeadings[newIndex],
         duration: 600,
		 beforeBegin:function(node) {
			dojo.style(leadinHeadings[currentIndex], "display", "none");
			dojo.style(node, "display", "block");
			dojo.style(node, "opacity", "0.1");
		 }
     }).play();
	
}