//  tooltips for news article links in the About section of the site  

var w3c = (document.getElementById) ? true:false;
var iex = (document.all) ? true:false;
var ns4 = (document.layers) ? true:false;
var supported = (w3c || iex || ns4) ? true:false;

var active = false;
var curObj;
var curNest;

function mousemoved (evt)
{
	if (iex) {
		mousex = window.event.clientX+document.body.scrollLeft;
		mousey = window.event.clientY+document.body.scrollTop;
	} else if(ns4) {
		mousex = evt.pageX+window.pageXOffset;
		mousey = evt.pageY+window.pageYOffset;
	} else {
		mousex = evt.pageX;
		mousey = evt.pageY;
	}
	
	if(active){
		shiftTo(curObj, mousex+50, mousey-20, curNest);
	}
	
	return true;
}

function getStyle (objstr, nest)
{
	nest = (nest) ? "document." + nest + "." : "";
	return (w3c) ? document.getElementById(objstr).style : (iex) ? document.all[objstr].style : (ns4) ? eval(nest+"document."+objstr) : false;
}

function shiftTo (objstr, x, y, nest)
{
	var obj = getStyle(objstr,nest);
	if (iex) {
		obj.pixelLeft = x;
		obj.pixelTop = y;
	} else if(ns4) {
		obj.moveTo(x,y);
	} else if(w3c) {
		obj.left = x;
		obj.top = y;
	}
}

function show (objstr,nest)
{
	curObj = objstr;
	curNest = (nest) ? nest : null;
	getStyle(objstr,nest).visibility = "visible";
	active = true;
}

function hide ()
{
	getStyle(curObj,curNest).visibility = "hidden";
	active = false;
}

if (supported) {
	if (ns4) {
		document.captureEvents(Event.MOUSEMOVE);
	}
	document.onmousemove = mousemoved;
}