var isIE = document.all?true:false;
var isNS = document.layers?true:false;

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;
}