function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;

function preloadToolbar() 
{
	if (document.images) 
	    {
		tb_1 = newImage("../../_imagens/toolbar/home_over.gif");
		tb_2 = newImage("../../_imagens/toolbar/pesquisa_over.gif");
		tb_3 = newImage("../../_imagens/toolbar/analises_over.gif");
		tb_4 = newImage("../../_imagens/toolbar/registo_over.gif");
		tb_5 = newImage("../../_imagens/toolbar/faq_over.gif");
		tb_6 = newImage("../../_imagens/toolbar/mapa_over.gif");
		tb_7 = newImage("../../_imagens/toolbar/contactos_over.gif");										
		preloadFlag = true;
	    }
}

//--------------------------------------------------------------

var w=1
var h=1

if (document.getElementById || document.all)
document.write('<div id="trailimageid" style="position:absolute;visibility:hidden;left:0px;top:-1000px;width:1px;height:1px;border:2px solid #acacac;background:#DDDDDD;"><img id="ttimg" src="images/s.gif" /></div>')

function gettrailobj()
{
	if (document.getElementById) return document.getElementById("trailimageid").style
	else if (document.all) return document.all.trailimagid.style
}

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

function hidetrail()
{
	document.onmousemove=""
	document.getElementById('ttimg').src='/_images/s.gif'
	gettrailobj().visibility="hidden"
	gettrailobj().left=-1000
	gettrailobj().top=0
}

function showtrail(width,height,file)
{
	if(navigator.userAgent.toLowerCase().indexOf('opera') == -1)
	{
		w=width
		h=height
		
		// followmouse()
	
		document.getElementById('ttimg').src=file
		document.getElementById('ttimg').width=width
		document.getElementById('ttimg').height=height
		document.onmousemove=followmouse
		gettrailobj().visibility="visible"
		gettrailobj().width=w+"px"
		gettrailobj().height=h+"px"
	}
}

function followmouse(e)
{
	if(navigator.userAgent.toLowerCase().indexOf('opera') == -1)
	{
		var xcoord=-45
		var ycoord=-70

		if (typeof e != "undefined")
		{
			xcoord+=e.pageX
			ycoord+=e.pageY
		}
		else if (typeof window.event !="undefined")
		{
			xcoord+=truebody().scrollLeft+event.clientX
			ycoord+=truebody().scrollTop+event.clientY
		}

		var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth-15
		var docheight=document.all? Math.max(truebody().scrollHeight, truebody().clientHeight) : Math.max(document.body.offsetHeight, window.innerHeight)

		if (xcoord+w+3>docwidth)
		xcoord=xcoord-w-(20*2)

		if (ycoord-truebody().scrollTop+h>truebody().clientHeight)
		ycoord=ycoord-h-20;

		gettrailobj().left=xcoord+"px"
		gettrailobj().top=ycoord+"px"
	}
}