How can I perform an ajax post to 2 php scripts at the same time?

Question

I am using the following ajax function to post to a php script. (url_one.php)

How could I post the same data (myvar1, myvar2) to a second php script (ajaxURL2) at the same time ? Is there a way to do this ?

function ajax_function() {
    var myvar1 = $('myvar1').val();
    var myvar2 = $('.myvar2:checked').val();
    var ajaxURL = window.location.protocol + "//" + window.location.host + "/"+"url_one.php";
    var ajaxURL2 = window.location.protocol + "//" + window.location.host + "/"+"url_two.php"; // <-- to 2nd url simultaneously

    $.ajax({
    async: false,
        type: "POST",
        url: ajaxURL,
    timeout : 8000,
        data: {functionname: 'my_php_function', arguments: [myvar1, myvar2]},
        success: function (data) {
        if( !('error' in data) ) {
        objDiv.scrollTop = objDiv.scrollHeight;
        }},
    });
}

The ajax function is being called every five seconds using setTimeout .. (and never misses a beat..)

setTimeout(function(){
    ajax_function() ; 
    //... something here ?
}, 5000);

Should I be looking at this part, to post to more than one script at the same time? or be looking into a php side solution. Many thanks in advance.