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Hola tarlipes,
oye, yo es que no veo el botón submit por ningún lado
De todas formas a ver si esto te furula
<Head>
<script language="JavaScript">
function abrirVentana() {
miVentana =open(
"","miVentana", "toolbar=no,directories=no,menubar=no,status=n o");
}
</script>
<Title>
</title>
<link rel="STYLESHEET" type="text/css" href="style1.css">
</head>
<body BGCOLOR = "CCCCCC">
<font style = verdana, arial size= 2>
<TABLE><tr align = center><td bgcolor = "#00008b" align = center WIDTH = 800><font color = "#FFFFFF"><%Response.Write " <h4>FORMULARIO DE BUSQUEDA<h4></font></td></tr></TABLE>"%>
<form action = "regula.asp" method= "post"
onsubmit="abrirVentana()" target="miVentana">
<table><TH><B>Base de Datos: <SELECT NAME = "BASE" >
<OPTION VALUE = "PUBNA" CHECKED>Pubna </OPTION>
<OPTION VALUE = "TEXTO">Texto </OPTION>
<OPTION VALUE = "INTA2">Prod.Intelectual </OPTION>
</SELECT> </TH>
<TH>
<B>Biblioteca: <SELECT NAME = "biblioteca">
<OPTION VALUE = "BRN">Recursos Naturales</OPTION>
</SELECT></TH><TH>
<
input type="submit" src="images/help.gif" width="20" height="20" border =0>
</TH></table>
</form><BR><P>
en negrita te puse los cambios o agregados