var hoverMaker = {
	offsetX: 250, // tooltip X offset
	offsetY: -40,  // tooltip Y offset
	element: null,
	DTs:     false,
	DDs:     false,
	on:      false,
	/* constructor - sets events */
	init: function(){
		var i=0;
		var ii=0;
		var currentLocation = 0;
		hoverMaker.DTs = document.getElementsByTagName('dt');
		hoverMaker.DDs = document.getElementsByTagName('dd');
		// only loop thru items once
		if( hoverMaker.on == false ){
			//loop through each DL on page
			i = 0;		
			// loop thru all DT elements
			while (hoverMaker.DTs.length > ii){
				// set the link for the current DT
			    hoverMaker.stripWhitespace(hoverMaker.DTs[ii]);
			    hoverMaker.stripWhitespace(hoverMaker.DTs[ii].parentNode);
				currentLocation = hoverMaker.DTs[ii].firstChild;
				// add events to links
				hoverMaker.addEvt(currentLocation,'mouseover',hoverMaker.showTooltip);//displays tooltip on mouse over
				hoverMaker.addEvt(currentLocation,'focus',hoverMaker.showTooltip);//display tooltip on focus, for added keyboard accessibility
				hoverMaker.addEvt(currentLocation,'blur',hoverMaker.hideTooltip);//hide tooltip on focus, for added keyboard accessibility
				hoverMaker.addEvt(currentLocation,'mouseout',hoverMaker.hideTooltip);//hide tooltip on focus, for added keyboard accessibility
				ii++;
			};
			ii=0;
			hoverMaker.on = true;
		};
	},
	/* SHOW TOOLTIP */
	showTooltip: function(event) {
        var evt = this;
		var i = 0;
		hoverMaker.hideTooltip();
		//Find DD to display - based on currently hovered anchor move to parent DT then next sibling DD
		var objid = evt.parentNode.nextSibling;
		hoverMaker.element = objid;//set for the hideTooltip
		//get width and height of background map
		var mapWidth  = objid.parentNode.offsetWidth;
		var mapHeight = objid.parentNode.offsetHeight;
		//get width and height of the DD
		var toopTipWidth = objid.offsetWidth;
		var toopTipHeight = objid.offsetHeight;
		//figure out where tooltip should be places based on point location
		var newX = event.clientX + hoverMaker.offsetX;
		var newY = event.clientY + hoverMaker.offsetY;
		//check if tooltip fits map width 
		objid.style.left = 350 + 'px';
		//check if tooltip fits map height 
		objid.style.top = newY + 'px';
	},
	/* HIDE TOOLTIP */
	hideTooltip: function() {
		if (hoverMaker.element != null) {
			hoverMaker.element.style.left = '-9999px';
		};
	},
	addEvt: function(element, type, handler) {
		// assign each event handler a unique ID
		if (!handler.$$guid) handler.$$guid = hoverMaker.addEvt.guid++;
		// create a hash table of event types for the element
		if (!element.events) element.events = {};
		// create a hash table of event handlers for each element/event pair
		var handlers = element.events[type];
		if (!handlers) {
			handlers = element.events[type] = {};
			// store the existing event handler (if there is one)
			if (element["on" + type]) {
				handlers[0] = element["on" + type];
			};
		};
		// store the event handler in the hash table
		handlers[handler.$$guid] = handler;
		// assign a global event handler to do all the work
		element["on" + type] = hoverMaker.handleEvent;
	},
	handleEvent: function(event) {
        var returnValue = true;
		// grab the event object (IE uses a global event object)
		event = event || hoverMaker.fixEvent(window.event);
		// get a reference to the hash table of event handlers
		var handlers = this.events[event.type];
		// execute each event handler
		for (var i in handlers) {
            if (i != 'toJSONString') {
			    this.$$handleEvent = handlers[i];
			    if (this.$$handleEvent(event) === false) {
			    	returnValue = false;
			    };
            }
		};
		return returnValue;
	},
	fixEvent: function(event) {
		// add W3C standard event methods
		event.preventDefault = hoverMaker.fixEvent.preventDefault;
		event.stopPropagation = hoverMaker.fixEvent.stopPropagation;
		return event;
	},
	stripWhitespace: function( el ){
		for(var i = 0; i < el.childNodes.length; i++){
			var node = el.childNodes[i];
			if( node.nodeType == 3 &&
				!/\S/.test(node.nodeValue) ) node.parentNode.removeChild(node);
		}
	}
};
hoverMaker.fixEvent.preventDefault = function() {this.returnValue = false;};
hoverMaker.fixEvent.stopPropagation = function() {this.cancelBubble = true;};
hoverMaker.addEvt.guid = 1;


/* LOAD SCRIPT */
	/* for Mozilla */
		if (document.addEventListener) {
			document.addEventListener("DOMContentLoaded", hoverMaker.init, null);
		};
		
	/* for Internet Explorer */
		/*@cc_on @*/
		/*@if (@_win32)
			document.write("<script defer src=ie_onload.js><"+"/script>");
		/*@end @*/
		
	/* for other browsers */
		hoverMaker.addEvt( window, 'load', hoverMaker.init);