Jquery UI Datepicker via Ajax call, issue in hiding weekdays dynamically

This is my code:

var hideweek;
var day;
var cloDays = new Array();
function initdatepicker(hideweek){

    var splitWeek = hideweek.split("&&");

    $.each( splitWeek, function( skey, svalue ) {
        cloDays[skey] = svalue;
    });

    $("#datepicker").datepicker({
        dateFormat: 'mm-dd-yy',
        showOn: "button",
        buttonImage: "<? bloginfo('template_directory') ?>/images/cal.png",
        buttonImageOnly: true,
        minDate: 0,
        beforeShowDay: function(date) {
            day = date.getDay();<br/>
            return [(day !=1 && day !=2)];
        }
    });
}

On ajax response I called this function 'initdatepicker' with parameter (1&&3&&5). Here 1, 3 and 5 are week days number which I don't want to show. So I split the string (hideweek) and stored in array (cloDays).

Now I need to make this portion of code dynamic.

##     return [(day !=1 && day !=2)];