Draw divs in elliptical shape with jQuery

Question

It seems that my math is not enough for my current task, so thats why i would like to ask help. The main thing is solved, i display the divs in elipsis shape, but i cannot solve how to take care to the dimension of the divs. The current solution works for shapes with equal sides, but my divs are not like that, their width are bigger than their height.

The current function look like this:

function drawEllipse(selector, x, y, a, b, angle) {
var steps = jQuery(selector).length;
var i = 0;
var beta = -angle * (Math.PI / 180);
var sinbeta = Math.sin(beta);
var cosbeta = Math.cos(beta);

jQuery(selector).each(function(index) {
    var alpha = i * (Math.PI / 180);
    i += (360 / steps);
    var sinalpha = Math.sin(alpha);
    var cosalpha = Math.cos(alpha);
    var X = x + (a * sinalpha * cosbeta - b * cosalpha * sinbeta);
    var Y = y - (a * sinalpha * sinbeta + b * cosalpha * cosbeta);
    X = Math.floor(X);
    Y = Math.floor(Y);

    //again, here's where the important X and Y coordinates are being output
    jQuery(this).css('margin-top', Y + 'px');
    jQuery(this).css('margin-left', X + 'px');
});
}

Thank you in advance.