// Extended Tooltip Javascript
// copyright 9th August 2002, 3rd July 2005, 24th August 2008
// by Stephen Chapman, Felgall Pty Ltd

// permission is granted to use this javascript provided that the below code is not altered
function pw() {
    return window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
}
function mouseX(evt) {
    return evt.clientX ? evt.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft) : evt.pageX;
} 
function mouseY(evt) {
    return evt.clientY ? evt.clientY + (document.documentElement.scrollTop || document.body.scrollTop) : evt.pageY;
} 
function popUp(evt,oi) {
    if (document.getElementById) {
	var wp = pw(); 
	dm = document.getElementById(oi); 
	ds = dm.style; 
	st = ds.visibility; 
	if (dm.offsetWidth) ew = dm.offsetWidth; 
	else if (dm.clip.width) ew = dm.clip.width; 
	if (st == "visible" || st == "show") { 
	    ds.visibility = "hidden"; 
	} 
	else {
	    tv = mouseY(evt) + 20; 
	    lv = mouseX(evt) - (ew/4); 
	    if (lv < 2) lv = 2; 
	    else if (lv + ew > wp) lv -= ew/2; 
	    lv += 'px';
	    tv += 'px';  
	    ds.left = lv; 
	    ds.top = tv; 
	    ds.visibility = "visible";
	}
    }
}