function isNumber(e)
{
	var keynum
	var keychar
	var numcheck
	if(e.keyCode) // IE
	{
		keynum = e.keyCode
	}
		else if(e.which) // Netscape/Firefox/Opera
	{
		keynum = e.which
		if(e.which == 8)return true;
	}
		keychar = String.fromCharCode(keynum)
		numcheck = /\d/
	return numcheck.test(keychar)
}