Change the options array of a select list

Question

Is there a way to change the options array of an html select list using javascript or mootools?

I need to replace the entire options set with a new one. In my ajax

Answer 1

var new_options = ['Option 1', 'Option 2', 'Option 3'];

/* Remove all options from the select list */
$('yourSelectList').empty();

/* Insert the new ones from the array above */
$each(new_options, function(value) {
    new Element('option')
        .set('text', value)
        .inject($('yourSelectList'));
});