<script language="JavaScript">
<!--
function numbersOnly(myfield, e){
    if (myfield.length ==0) myfield.value=0;  
	var key;
	var keychar;
    if (window.event)
		key = window.event.keyCode;
    else if (e)
     	key = e.which;
    else
     	return true;

	keychar = String.fromCharCode(key);
    if ((key==null) || (key==0) || (key==8) ||  (key==9)|| (key==13)|| (key==27) )
		return true;
    else if ((("0123456789").indexOf(keychar) > -1))
	    return true;
	else
		return false;
}
//-->
</script>
