function show(cam){
	if(document.layers)
		window.document.layers[cam].visibility="show"
	else
		window.document.all[cam].style.visibility="visible"
}

function hide(cam){
	if(document.layers)
		window.document.layers[cam].visibility="hidden"
	else
		window.document.all[cam].style.visibility="hidden"
}

function abre(url,name){
	newWin=window.open(url,name,"width=620,height=400,toolbar=0,scrollbars=1,menubar=0,status=1")
	if(newWin!=null)
		newWin.focus()
	return
}

function fecha(){
	if(!window.opener.closed)
		window.opener.focus()
	window.close()
}

function volta(){
	window.history.go(-1)
}

function getURL(url){
	window.location=url
}

function scrollup(){
	self.scrollTo(0,0)
}

function estat() {
	local=window.open('estat/index.php','estatisticas',"width=350,height=400,toolbar=0,scrollbars=1,menubar=0,status=0");
	if(local!=null)
		local.focus()
	return
}

function isEmpty(s){
    return ((s == null) || (s.length == 0))
}

function popup(url,name){
	newWin=window.open(url,name,"width=290,height=250,toolbar=0,scrollbars=0,menubar=0,status=0,location=no,directories=no,resizable=no")
	if(newWin!=null)
		newWin.focus()
	return
}