Question

I have a function that works out the past 3 months and displays the name by using an array.

I’ve just realised that when the new year comes round, for January, February & March, it won’t be able to get the correct month.

I want to be able to do this without having to add in a hack (which is the only way I’ve seen to do this)

function getMonths()
    {
        var today = new Date();             
        var month = 0;
        var currMonth = month-3;

        var monthArray = new Array("January","February","March","April","May","June",
                "July","August","September","October","November","December");

        var menuMonths = new Array();
        var count = 4;
        var buffer = 10;

        while(count >0)
        {           
            var month = monthArray[currMonth];
            alert(currMonth);
            menuMonths.push(month);

            currMonth = currMonth +1;
            count = count -1;
        }       
        return menuMonths;
    }   

Answer 1

This little addition to your while-loop will ensure that currMonth is always a valid index of your monthArray:

 while(count >0)
    {           
        if (currMonth < 0)
            currMonth += 12;
        if (currMonth >=12 )
            currMonth -= 12;

        var month = monthArray[currMonth];
        menuMonths.push(month);

        currMonth = currMonth +1;
        count = count -1;
    }       

working example: http://jsfiddle.net/RWhN4/
This is a bit hackish, but it should do what you want.