[Graeme Hackston]

Or, you can use typeof right in the function but this is adding yet another condition for the function to check.

If you use it like this you can remove .toString() from the function calls in Johns script.

function num_abbrev_str(num) {
if (typeof num == 'number') {
num = num.toString()
}
var len = num.length, last_char = num.charAt(len - 1), abbrev
if (len == 2 && num.charAt(0) == '1') {
abbrev = 'th'
} else {
if (last_char == '1') {
abbrev = 'st'
} else if (last_char == '2') {
abbrev = 'nd'
} else if (last_char == '3') {
abbrev = 'rd'
} else {
abbrev = 'th'
}
}
return num + abbrev
}

alert(num_abbrev_str('22'))

alert(num_abbrev_str(22))