Otra validacion q no sale.

[jpalbox]

alert( "Por favor, rellena el campo Usuario/Socio." );
form.usuario.focus();
return false ;
}else if (form.password.value == "") {
alert( "Por favor, rellena el campo Contraseña." );
form.password.focus();
return false ;
}
return true ;
}
//-->

</script>


<form action="altas.asp" METHOD="post" onsubmit="return informacion(this);">
<div><div align="center"><center><tabl e border="0" cellpadding="0" width="750"
height="252" cellspacing="0">
<tr>
<td height="6" width="780" valign="top" align="left">  <div align="center"><center><tabl e
border="0" cellpadding="0" width="750" cellspacing="0">
<tr>
<td height="40" width="83"><font face="Verdana" size="1">Fecha Alta:</font></td>
<td height="40" width="206"><font face="Verdana" size="1"><select name="diai" size="1">
<option selected="Día">Día</option>
<option value="01">01</option>
<option value="02">02</option>
<option value="03">03</option>
<option value="04">04</option>
<option value="05">05</option>
<option value="06">06</option>
<option value="07">07</option>
<option value="08">08</option>
<option value="09">09</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
<option value="13">13</option>
<option value="14">14</option>
<option value="15">15</option>
<option value="16">16</option>
<option value="17">17</option>
<option value="18">18</option>
<option value="19">19</option>
<option value="20">20</option>
<option value="21">21</option>
<option value="22">22</option>
<option value="23">23</option>
<option value="24">24</option>