totaling arrays

[planedriver]

anyone have a quick way to loop through an array using javascript and return a total. the array is a form element index array all named the same such as hoursworked[] because the array is generated by a php while loop.

[Bernard Marx]

Array.prototype.getTotal = function()
{
    var total = k = 0;
    while(k<this.length)
        total += this[k++];
    return total;
}

var allHours = [1,2,3];

var total = allHours.getTotal();

// Assuming that all the values are actually numbers of course!