function popup(url,target)
{
	w = screen.width*(3/4);
	h = screen.height*(3/4);
	l = (screen.width-w)/2;
	t = (screen.height-h)/2;
	widthHeight = "width="+w+",height="+h+",left="+l+",top="+t+",menubar=no,resizable=yes,scrollbars=no,status=no,toolbar=no,location=no";
	window.open(url,target,widthHeight);
	return true
}



function openchat(oForm)
{
	if (oForm.nick.value.length == 0)
	{
		alert ('Inserisci un nick prima di entrare in chat');
	}
	else
	{
		s = 'index.php' + '?nick=' + oForm.nick.value;
		popup(s,'chatroom');
	}
	return false;
}