Campos que admitan solo numeros

[TReiLeR]

Èste Ocupo yo

<script language="JavaScript">
<!--
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 <= 13 || (key >= 48 && key <= 57) || );
}
//-->
</script>

y Luego...

<input type="text" name="numeros" onKeyPress="return acceptNum(event)">

LISTO.