How to determine number Saturdays and Sundays comes between two dates in java script

Question

I have requirement as follows I have two dates i need to find how may saturdays and sundays will come in between
Date1: 02/06/2011
Date2: 02/07/2011
10 days are

Answer 1

Edited to count number of weekend days instead of number of weekends. http://jsfiddle.net/bRgUq/3/

function CalculateWeekendDays(fromDate, toDate){
    var weekendDayCount = 0;

    while(fromDate < toDate){
        fromDate.setDate(fromDate.getDate() + 1);
        if(fromDate.getDay() === 0 || fromDate.getDay() == 6){
            ++weekendDayCount ;
        }
    }

    return weekendDayCount ;
}

console.log(CalculateWeekendDays(new Date(2011, 6, 2), new Date(2011, 7, 2)));