Cookie question

Hey, I recently bought "The Javascript and DHTML Cookbook" by Danny
Goodman.

I'm at Chapter 1, part 1.9 "Reading and Writing Strings for Cookies"
and was just interested in a utility function that grabs a cookie
value:

function getCookieVal(offset) {
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1) {
endstr = document.cookie.length;
}
return unescape(document.cookie.substring(offset, endstr));
}

The part I don't understand is the if statement within the function,
why is it checking if endStr equals to false?

The book is kinda vague in explaining what this means! Any help would
be great.

Cheers

.

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