Código HTML:
<html> <head> <title></title> <script type="text/JavaScript"> <!-- function redi() { PopUpgen = window.open("", "ventana","top=50, left=50, height=500, width=800"); document.form1.action="nuevo.php"; document.form1.target = "ventana"; document.form1.submit(); } //--> </script> </head> <body> <form action="pruebas2.htm" name="form1" method="POST"> <input name="nueva" type="button" id="nueva" onclick="javascript:redi()" value="nueva ventana"/> <input name="enviar" type="submit" id="enviar" value="Enviar" title="Guardar" /> </form> </body> </html>