La forma correcta de abrir una ventana:
Código HTML:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="es" xml:lang="es">
<head>
<title>Hola</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"></meta>
<script type="text/javascript">
function abrir( a, b, c) {
window.open(a,b,c);
return false;
}
</script>
</head>
<body>
<a href="http://www.miweb.com?id=1289" onclick="return abrir(this.href, 'a', '');">asd</a>
</body>
</html>