Código PHP:
  
<script languaje="javascript">
 
function validar(form)
{
    if (form.Funcionarios.options[form.Funcionarios.selectedIndex].value == 0)
        {
    alert("Por favor, seleccione una opción válida");
 
    form.Funcionarios.focus(); return true;
 
    }
 
form.submit();
 
}
 
</script>
</head>
 
<link href="Estilos/equipos.css" rel="stylesheet" type="text/css">
<body bgcolor="#E2E2E2">
<?php
 include("conex.php");
 $link=Conectarse();
 ?>
<table width="650" border="1" >
  <!--DWLayoutTable-->
  <tr> 
    <td width="650" height="20" valign="top" bgcolor="#99CC33"> 
      <div align="center"><font color="#FF6600" size="3" face="Courier New, Courier, mono"><strong>.:INGRESE 
        PROBLEMAS:.</strong></font></div></td>
  </tr>
</table>
<table width="650" border="0" cellpadding="0" cellspacing="0">
  <!--DWLayoutTable-->
  <form name="form4" method="post" action="ProblemasProcesar.php">
    <tr> 
      <td height="12" colspan="17" valign="top" bgcolor="#CCCC33"><strong><em>Información 
        Del Usuario</em></strong></td>
    </tr>
    <tr> 
      <td width="30" height="7"></td>
      <td width="60"></td>
      <td width="2"></td>
      <td width="125"></td>
      <td width="22"></td>
      <td width="2"></td>
      <td width="1"></td>
      <td width="10"></td>
      <td width="27"></td>
      <td width="36"></td>
      <td width="16"></td>
      <td width="24"></td>
      <td width="1"></td>
      <td width="107"></td>
      <td width="34"></td>
      <td width="135"></td>
      <td width="18"></td>
    </tr>
    <tr> 
      <td height="20"></td>
      <td></td>
      <td></td>
      <td colspan="3" valign="top"> <select name="Funcionarios"  id="Rut_Asignado">
          <option value="" >Elija el Rut</option>
          <?php      
       $result=mysql_query("SELECT * FROM Funcionarios",$link);
        while($row=mysql_fetch_array($result))
        echo ('<option value="'.$row["Rut_Asignado"].'">'.$row["Rut_Asignado"].'</option>');
             ?>
        </select> </td>
     
    </tr>
    <tr> 
      <td height="48"></td>
      
    </tr>
    <tr> 
      <td height="12" colspan="17" valign="top" bgcolor="#CCCC33"><strong><font color="#000000" size="1"> 
        <em>Problema</em></font></strong></td>
    </tr>
    <tr> 
      <td height="6"></td>
    
    </tr>
    <tr> 
      <td height="4"></td>
      <td></td>
      <td></td>
      <td colspan="3" rowspan="3" valign="top"> <select name="Prioridad" id="Prioridad" >
          <option>Elija Prioridad</option>
          <option>Bajo</option>
          <option>Mediano</option>
          <option>Alto</option>
        </select> </td>
     
      <td colspan="2" rowspan="3" valign="top"> <select name="Estado" id="Estado">
          <option>Elija Estado</option>
          <option>Abierto</option>
          <option>En Progreso</option>
          <option>No Asignado</option>
          <option>Respuesta en Espera</option>
        </select> </td>
      <td></td>
      <td></td>
    </tr>
    <tr> 
      <td height="12"></td>
      <td valign="top"><strong><font color="#000000" size="1">Prioridad:</font></strong></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td colspan="3" valign="top"><strong>Estado:</strong></td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    <tr> 
      <td height="4"></td>
      
    </tr>
    <tr> 
      <td height="20"> </td>
      <td></td>
      <td></td>
      <td> </td>
      <td> </td>
      <td> </td>
  
    </tr>
    <tr> 
      <td height="12"  colspan="17"   valign="top" bgcolor="#CCCC33"><strong><em>Información 
        Del Problema</em></strong></td>
    </tr>
    <tr> 
      <td height="14"></td>
     
   
    </tr>
    <tr> 
      <td height="4"></td>
      <td></td>
      <td></td>
      <td rowspan="3" valign="top"> <select name="Sistema" id="Sistema" >
          <option>Eliga la Opción</option>
          <option>Win XP Profesional</option>
        </select> </td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td colspan="2" rowspan="3" valign="top"> <select name="Categoria" id="Categoria" >
          <option>Elija Categoría</option>
          <option>Sist. Operativo</option>
          <option>Hadware</option>
          <option>Software</option>
          <option>Config. Web</option>
          <option>Otro</option>
        </select> </td>
      <td></td>
      <td></td>
    </tr>
    <tr> 
      <td height="12"></td>
      <td valign="top"><strong>S. O.:</strong></td>
 
      <td colspan="2" valign="top"><strong>Categoría:</strong></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    <tr> 
      <td height="4"></td>
  
    </tr>
    <tr> 
      <td height="16"></td>
    
      
    </tr>
    <tr> 
      <td height="2"></td>
      <td rowspan="2" valign="top"><strong>Descripción:</strong></td>
      <td></td>
      <td colspan="11" rowspan="4" valign="top"> <input name="Descripcion" type="text" id="Descripcion" size="70" maxlength="90"> 
      </td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <td height="10"></td>
      <td></td>
      <td colspan="2" rowspan="2" valign="top"><font color="#FF0000"><strong>Máx. 
        70 Caracteres</strong></font></td>
    <td></td>
    </tr>
    <tr> 
      <td height="2"></td>
      <td rowspan="3" valign="top"><div align="center"><font color="#FF0000"><strong>(Corta)</strong></font></div></td>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <td height="3"></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    <tr> 
      <td height="7"></td>
      <td></td>
      
    </tr>
    <tr> 
      <td height="20"></td>
      <td> </td>
    
    </tr>
    <tr> 
      <td height="2"></td>
      <td rowspan="3" valign="top"><strong>Nº Error:</strong></td>
      <td></td>
      <td colspan="4" rowspan="3" valign="top"> <input name="Error" type="text" id="Error" size="30"> 
      </td>
      
    </tr>
    <tr> 
      <td height="12"></td>
      <td></td>
      <td></td>
      <td colspan="3" valign="top"><strong><font color="#FF0000">Opcional</font></strong></td>
      
    </tr>
    <tr> 
      <td height="3"></td>
  
      <td></td>
    </tr>
    <tr> 
      <td height="24"></td>
      <td> </td>
      
      <td> </td>
      <td> </td>
    </tr>
    <tr> 
      <td height="22"></td>
      <td> </td>
      <td></td>
      <td></td>
      <td></td>
      <td colspan="5" valign="top"> <input name="Ingresar" type="submit" id="Ingresar" value="Ingresar" onClick="validar(this.form)"> 
      </td>
      <td> </td>
      
    </tr>
  </form>
</table>   
 
 
