function open_win(a,w,h) {
	window.open(a,'','toolbar=no,status=no,scrollbars=yes,location=no,menubar=no,directories=no,width='+w+',height='+h)
}

var lastbox = '';
function showbox(name) {
	document.getElementById(name).style.display = 'block';
	if(lastbox!=''){
		hidebox(lastbox);
		if(lastbox==name) { lastbox=''; }
		else {lastbox=name;}
	} else {
		lastbox=name;
	}
}
function hidebox(name) {
	document.getElementById(name).style.display = 'none';
}