Checking X Days Out

I need some JS code that will let me check and see if the date the user enters is within certain guidelines. ie...(no less than 2 days out and no more than 90 days out.)

Someone was kind enough to give me this code, but I can't get it to work correctly. Everything always returns false. If I am reading this write, if it returns false, then the conditions are not met.

Any ideas?

function compareDates(myDate, min, max)
{
var now = new Date().getTime();
var then = new Date(myDate).getTime();
var diff = (now - then) / 86400000;
var valid = true;

var min = min * 86400000;
var max = max * 86000000;

if (diff <= min || diff >= max) {
alert(diff + " " + min + " " + max);
return false;
}
return valid;
}
new compareDates("08/10/03", 2, 90);