Código HTML:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script language="javascript"> function cambiar(evt){ //asignamos el valor de la tecla a keynum if(window.event){// IE keynum = evt.keyCode; }else{ keynum = evt.which; } //comprobamos si se encuentra en el rango if(keynum=9){ document.getElementById('cedula').focus(); } } </script> </head> <body> <table> <form> </form> </table> </body> </html>