var ibanLen = { 
	NO:15, BE:16, DK:18, FI:18, FO:18, GL:18, NL:18, MK:19,
	SI:19, AT:20, BA:20, EE:20, KZ:20, LT:20, LU:20, CR:21,
	CH:21, HR:21, LI:21, LV:21, BG:22, BH:22, DE:22, GB:22,
	GE:22, IE:22, ME:22, RS:22, AE:23, GI:23, IL:23, AD:24,
	CZ:24, ES:24, MD:24, PK:24, RO:24, SA:24, SE:24, SK:24,
	VG:24, TN:24, PT:25, IS:26, TR:26, FR:27, GR:27, IT:27,
	MC:27, MR:27, SM:27, AL:28, AZ:28, CY:28, DO:28, GT:28,
	HU:28, LB:28, PL:28, BR:29, PS:29, KW:30, MU:30, MT:31
}

function isValid(iban) {
	iban = iban.replace(/\s/g, '')
	if (!iban.match(/^[\dA-Z]+$/)) return false
	var len = iban.length
	if (len != ibanLen[iban.substr(0,2)]) return false
	iban = iban.substr(4) + iban.substr(0,4)
	for (var s='', i=0; i<len; i+=1) s+=parseInt(iban.charAt(i),36)
	for (var m=s.substr(0,15)%97, s=s.substr(15); s; s=s.substr(13)) m=(m+s.substr(0,13))%97
	return m == 1
}

document.write(isValid('GB82 WEST 1234 5698 7654 32'), '<br>')