function voltar(){
	history.go(-1)
}
var activateMenu ;
activateMenu = function(nav) {
	/* currentStyle restricts the Javascript to IE only */
	if (document.getElementById(nav).currentStyle) {  
		var navroot = document.getElementById(nav);
		
		/* Get all the list items within the menu */
		var lis=navroot.getElementsByTagName("LI");  
		for (i=0; i<lis.length; i++) {
		
		   /* If the LI has another menu level */
			if(lis[i].lastChild.tagName=="UL"){
			
				/* assign the function to the LI */
				lis[i].onmouseover=function() {	
				
				   /* display the inner menu */
				   this.lastChild.style.display="block";
				}
				lis[i].onmouseout=function() {                       
				   this.lastChild.style.display="none";
				}
			}
		}
	}
}
window.onload= function(){
	activateMenu('vertnav'); 
}
window.onMouseDown = function() {
	alert(document.body.clientWidth);
}
function showElement(id) {
if(document.getElementById(id).style.display != 'block'){
		document.getElementById(id).style.display= 'block';
		document.getElementById(id).style.visibility = 'visible';
		document.getElementById(id).style.position = 'static';
	}else {
		document.getElementById(id).style.display= 'none';
		document.getElementById(id).style.visibility = 'hidden';
		document.getElementById(id).style.position = 'static';
	}
}
// JavaScript Document
var startList;
startList = function() {
	if (document.all&&document.getElementById) {
		navRoot = document.getElementById("nav");
		for (i=0; i<navRoot.childNodes.length; i++) {
			node = navRoot.childNodes[i];
			if (node.nodeName=="LI") {
				node.onmouseover=function() {
					this.className+=" over";
				}
				node.onmouseout=function() {
					this.className=this.className.replace(" over", "");
				}
			}
		}
	}
}
window.onload=startList;

function imgPopOpen(ficheiro,w,h){
	var left=Math.floor((screen.width-350)/2);
	var top=Math.floor((screen.height-350)/2);
	imgPop=window.open('img.php?imagem='+ficheiro,'imgPop','top='+top+',left='+left+',width='+w+',toolbar=no,height='+h);
	imgPop.focus();
	return false
}