<script language="JavaScript">
 
		function popup(url, nwidth, nheight) {
			var width = nwidth;
			var height = nheight;
			var left = (screen.width - width)/2;
			var top = (screen.height - height)/2;
			var params = 'width='+width+', height='+height;
			params += ', top='+top+', left='+left;
			params += ', directories=no';
			params += ', location=no';
			params += ', menubar=no';
			params += ', resizable=yes';
			params += ', scrollbars=yes';
			params += ', status=no';
			params += ', toolbar=no';
			newwin = window.open(url, 'titulo', params);
			if(window.focus) {
				newwin.focus();
			}
			return false;
		}
 
	</script>

 
	<script language="JavaScript">
 
		function verificar(form)
		   {
 
			 var url = "minhaPagina.php?";
 
			 elementosForm = form.getElementsByTagName("input");
 
			 for(i=0; i<elementosForm.length; i++)	{
				url = url + elementosForm[i].name + "=" + elementosForm[i].value + "&";
			 }
 
			 elementosFormSelect = form.getElementsByTagName("select");
 
			 for(i=0; i<elementosFormSelect.length; i++)	{
				url = url + elementosFormSelect[i].name + "=" + elementosFormSelect[i].value + "&";
			 }
 
			//Aqui chamamos nossa funcao do ''popup'' e passamos a nossa url montada 
                        popup(url, 400, 400);
		   }
		</script>

 
<form name="editUser" method="post">
 
	Meu Input <input type="text" name="meuInput" ><br /><br />
	Meu Select 
		<select name="meuSelect">
			<option value="1">A</option>
			<option value="2">B</option>
			<option value="3">C</option>
		</select><br /><br />
 
	<input type="button" value="Verificar Valores" onClick="verificar(this.form)">	
 
</form>
 
<br /><br />
 
<!-- Aqui tambme podemos chamar o popup no evento onclick de um link -->
<a href="#" onClick="popup('onnClick.net/blog', 400, 400);">Abrir o popUp</a>