Sobre keypress

[bet]

Te dejo un script que utilizo para ese fin, espero que te sirva.

<pre>
&lt;html&gt;
&lt;head&gt;
&lt;title&gt; New Document &lt;/title&gt;

&lt;script language=&quot;JavaScript&quot;&gt;
&lt;!--
var nav4 = window.Event ? true : false;

function acceptNum(evt)
{
// NOTE: Backspace = 8, Enter = 13, '0' = 48, '9' = 57
var key = nav4 ? evt.which : evt.keyCode;
return (key &lt;= 13 || (key &gt;= 48 &amp;&amp; key &lt;= 57));
}
//--&gt;
&lt;/script&gt;
&lt;/head&gt;

&lt;body&gt;
&lt;input type=text name=&quot;valor&quot; size=12 maxlength=12 onKeyPress=&quot;return acceptNum(event)&quot;&gt;

&lt;/body&gt;
&lt;/html&gt;

</pre>

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