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);
	if ((key==null) || (key==0) || (key==8) ||
			(key==9) || (key==13) || (key==27) )
		 return true;
	else if ((("0123456789").indexOf(keychar) > -1))
		 return true;
	else if (dec && (keychar == "."))
		 {
		 myfield.form.elements[dec].focus();
		 return false;
		 }
	else
		 return false;
}