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=iso-8859-1" /> <script language="javascript"> function numeros() { x=window.event.keyCode; if (x<48 || x>57){ window.event.keyCode=0; } } </script> </head> <body> <form id="form1" name="form1" method="post" action=""> DNI: <label> <input name="dni" type="text" id="dni" onkeypress="numeros()"/> </label> </form> </body> </html>