var dofade=true;     // ENABLES FADE-IN EFFECT FOR IE4+ AND NS6 ONLY
var center=false;     // CENTERS THE BOX UNER THE MOUSE, OTHERWISE DISPLAYS BOX TO THE RIGHT OF THE MOUSE
var centertext=false; // CENTERS THE TEXT INSIDE THE BOX. YOU CAN'T SIMPLY DO THIS VIA STYLE BECAUSE OF NS4.
                     // OTHERWISE, TEXT IS LEFT-JUSTIFIED. 

function ietruebody()
{
	return (document.compatMode && document.compatMode!="BackCompat")?document.documentElement:document.body
}

var NS4=(navigator.appName.indexOf("Netscape")>=0 && !document.getElementById)? true : false;
var IE4=(document.all && !document.getElementById)? true : false;
var IE5=(document.getElementById && document.all)? true : false;
var NS6=(document.getElementById && navigator.appName.indexOf("Netscape")>=0 )?true:false;
var W3C=(document.getElementById)?true:false;
var w_y,w_x,navtxt,boxheight,boxwidth;
var ishover=false;
var isloaded=false;
var ieop=0;
var op_id=0;

function getwindowdims()
{
	w_y=(NS4||NS6||window.opera)? window.innerHeight :(IE5||IE4)? document.body.clientHeight:0;
	w_x=(NS4||NS6||window.opera)? window.innerWidth:(IE5||IE4)? document.body.clientWidth:0;
}

function getboxwidth()
{
	if(NS4)boxwidth=(navtxt.document.width)?navtxt.document.width:navtxt.clip.width;
	if(IE5||IE4)boxwidth=(navtxt.style.pixelWidth)?navtxt.style.pixelWidth:navtxt.offsetWidth;
	if(NS6)boxwidth=(navtxt.style.width)?parseInt(navtxt.style.width):parseInt(navtxt.offsetWidth);
}

function getboxheight()
{
	if(NS4)boxheight=(navtxt.document.height)? navtxt.document.height : navtxt.clip.height;
	if(IE4||IE5)boxheight=(navtxt.style.pixelHeight)? navtxt.style.pixelHeight : navtxt.offsetHeight;
	if(NS6)boxheight=parseInt(navtxt.offsetHeight);
}

function movenavtxt(x,y)
{
	if(NS4)navtxt.moveTo(x,y);
	if(W3C||IE4)
	{
		navtxt.style.left=x+'px';
		navtxt.style.top=y+'px';
	}
}

function getpagescrolly()
{
	if(NS4||NS6)return window.pageYOffset;
	if(IE5||IE4)return ietruebody().scrollTop;
}

function getpagescrollx()
{
	if(NS4||NS6)return window.pageXOffset;
	if(IE5||IE4)return ietruebody().scrollLeft;
}

function writeindiv(text)
{
	if(NS4)
	{
		navtxt.document.open();
		navtxt.document.write(text);
		navtxt.document.close();
	}
	if(W3C||IE4)navtxt.innerHTML=text;
}

function writetxt(text)
{
	if(isloaded)
	{
		if(text!=0)
		{
			ishover=true;
			if(NS4)
				text='<div class="navtext">'+((centertext)?'<center>':'')+text+((centertext)?'</center>':'')+'</div>';
			writeindiv(text);
			getboxheight();
			if((W3C || IE4) && dofade)
			{
				ieop=0;
				incropacity();
			}
		}
		else
		{
			if(NS4)navtxt.visibility="hide";
			if(IE4||W3C){
				if(dofade)clearTimeout(op_id);
				navtxt.style.visibility="hidden";
			}
			writeindiv('');
			ishover=false;
		}
	}
}

function incropacity()
{
	if(ieop<=100)
	{
		ieop+=10;
		if(IE4 || IE5)navtxt.style.filter="alpha(opacity="+ieop+")";
		if(NS6)navtxt.style.MozOpacity=ieop/100;
		op_id=setTimeout('incropacity()',15);
	}
}

function moveobj(evt)
{
	if(isloaded && ishover)
	{
		margin=(IE4||IE5)?1:23;
		if(NS6)
			if(document.height+27-window.innerHeight<0)
				margin=15;
		if(NS4)
			if(document.height-window.innerHeight<0)
				margin=10;
		//mx=(NS4||NS6)? evt.pageX : (IE5||IE4)? event.clientX : 0;
		//my=(NS4||NS6)? evt.pageY : (IE5||IE4)? event.clientY : 0;
		if (NS4)
		{
			mx=evt.pageX
			my=evt.pageY
		}
		else if (NS6)
		{
			mx=evt.clientX
			my=evt.clientY
		}
		else if (IE5)
		{
			mx=event.clientX
			my=event.clientY
		}
		else if (IE4)
		{
			mx=0
			my=0
		}
	
		if(NS4)
		{
			mx-=getpagescrollx();
			my-=getpagescrolly();
		}

		xoff=(center)?mx-boxwidth/2:mx+5;
		yoff=(my+boxheight+30-getpagescrolly()+margin>=w_y)?-15-boxheight:30;
		movenavtxt( Math.min(w_x-boxwidth-margin,Math.max(2,xoff))+getpagescrollx(),my+yoff+getpagescrolly());
		if(NS4)navtxt.visibility="show";
		if(W3C||IE4)navtxt.style.visibility="visible";
	}
}

if(NS4)
	document.captureEvents(Event.MOUSEMOVE);

document.onmousemove=moveobj;
function initToolTip() 
{
	navtxt=(NS4)?document.layers['navtxt']:(IE4)?document.all['navtxt']:(W3C)?document.getElementById('navtxt'):null;
	getboxwidth();
	getboxheight();
	getwindowdims();
	isloaded=true;
	if((W3C || IE4) && centertext)
		navtxt.style.textAlign="center";
	if(W3C)
		navtxt.style.padding='4px';
	if(IE4 || IE5 && dofade)
		navtxt.style.filter="alpha(opacity=0)"; 
}

Event.observe(window,'load',initToolTip,false);
window.onresize=getwindowdims;