urgent... how to get filename from "a:\b\c.txt"

[ray]

i have a <input type=file> and trying to get the filename from user input.

i tried the following but doesn't seem to work.

function getFilename(s){
var fn = new String();
fn = s;
return fn.substr(fn.lastIndexOf("\\"), fn.length());
}

i think the single "\" from the file input box screw me up.

ray