function numbersOnly(myfield, e, dec)
{
	var key;
	var keychar;

	if (window.event)
   		key = window.event.keyCode;
	else if (e)
   		key = e.which;
	else
   		return true;
	keychar = String.fromCharCode(key);

	// control keys
	if ((key==null) || (key==0) || (key==8) || (key==9) || (key==13) || (key==27) )
   		return true;

	// numbers
	else if ((("0123456789").indexOf(keychar) > -1))
   		return true;

	// decimal point jump
	else if (dec && (keychar == "."))
  	{
   		myfield.form.elements[dec].focus();
   		return false;
   	}
	else
   	return false;
}