Espero que le sirva a mas de uno...
Código:
<html> <head> <script type="text/javascript"> function jva001(slc, inp){ // Da el valor de un select con id="slc" a un input con id="inp" document.getElementById(inp).value=document.getEle mentById(slc).value; } function jva002(slc, inp, inp001){ // Da el valor de un select con id="slc" a un input con id="inp" document.getElementById(inp).value=document.getEle mentById(slc).options[document.getElementById(slc).selectedIndex].text; document.getElementById(inp001).value=document.get ElementById(slc).value; } </script> </head> <body> <form name="formulario" action="post" metodh="get"> <select name="seleccion" id="slc" onClick="jvr001('slc','val');"> <option value="1">UNO</option> <option value="2">DOS</option> <option value="3">TRES</option> </select> <input name="ingresa" id="val"> <br> <select name="seleccion" id="sel" onClick="jvr002('sel','var','txt');"> <option value="1">UNO</option> <option value="2">DOS</option> <option value="3">TRES</option> </select> <input name="ingresa" id="var"> <input name="ingresa" id="txt"> </form> </body> </html>