Path: C:\
<script type="text/javascript">
function Busca(){
window.open("about:blank","Busca","toolbar=no, status=no, menubar=no, scrollbars=no, resizable=no, width=800, height=400, top=50, left=20");
document.formBusca.submit();
}
</script>
<aside class="col-md-9" role="main">
<div class='panel panel-primary'>
<div class='panel-heading'>
<h2 class='panel-title' align='center'>Digite o número da NF a pesquisar:</h2>
</div>
<table class="table" align="center" >
<tr>
<td align="center"width="20%">
<div id='busca'>
<form method="post" action="busca.php" name='formBusca' target='Busca'>
<input type='text' name='numero' id='numero' size="13" placeholder='Digite o nº NF ' autofocus />
<button type="submit" class="button2" onclick='javascript:Busca();'>ok</button>
</form>
</div>
</td>
</tr>
</table>
</div>
</aside>