timestamp from javascript date

Hi everybody, here's simple extension for javascript Date object. It returns timestamp in seconds in local time. Locale is taken from users browser.

Date.prototype.getTimestamp = function () 
{
        var date = this;
        var timestamp = Math.round(date.getTime()/1000);
        timestamp = timestamp - (date.getTimezoneOffset () * 60); 
    
        return timestamp;
}

usage is simple:

var new_Date = Date();
alert(date.getTimestamp());

Foreach equivalent in javascript

foreach function in PHP is very nice and easy to use. I was searching for equivalent in javascritp and there are two possibilities.

1. without jquery:

var new_array = new Array();
new_array[0] = 'foo';
new_array[1] = 'bar';

for (var key in new_array)
{
    alert(new_array[key]);
}

2. using jquery

var new_array = new Array();
new_array[0] = 'foo';
new_array[1] = 'bar';

$.each(new_array, function(key, value)
    {
        alert(key + '=>' + value);
    });

if you now another option using some other framework, please add it to discussion, thanks