Funcion javascript para abrir pagina html y cerrar la maestra

 window.showModalDialog("news.html", "argumentos", "dialogHeight: 280px; dialogWidth: 280px; dialogTop: 100px; dialogLeft: 100px; center: no; resizable: no; status: no;");


<script type="text/javascript">
function url() {
hidden = open('frmEnvioFact.aspx','NewWindow','center=50, top =50 , width=450,height=600,status=yes,resizable=no,scrollbars=no');

window.open("","_parent","");
var ventana = window.self;
ventana.opener = window.self;
ventana.close();
}

</script>
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<SCRIPT LANGUAGE="JavaScript">
function url() {
hidden = open('frmEnvioFact.aspx','NewWindow','center=50, top =50 , width=450,height=600,status=yes,resizable=yes,scrollbars=yes');
}
</SCRIPT>


<SCRIPT LANGUAGE="JavaScript">
function url() {
hidden = open('frmEnvioFact.aspx','NewWindow','center=50, top =50 , width=450,height=600,status=no,resizable=no,scrollbars=no');
}
</SCRIPT>