Responsive and javascript problem

I have two problems: I’d like to set the window into the center, but the script it throws on some resolutions sometimes in the right.
So is there a way to trigger custom script to set the window position?
Are there any callback to use it?
I tried following code:

// Resize event for reposition
jQuery(window).bind('resize orientationchange', function($) {
		if (document.getElementById('eModal-1'))
		{
            reposition();
		}
		else return true;

			// Repositions the modal

	 });
var reposition = function() {
  // Elements must be visible before height calculation
  //$('#eModal-1, #pgwModalBackdrop').show();
	emodal_top();

	var windowWidth = $(window).width();
	var modalWidth = $('#eModal-1 .emodal-content').first().outerWidth();
	var modalLeft = Math.round((windowWidth - modalWidth) / 2);
	$('#eModal-1').css('left',modalLeft);
    return true;
 }

 var emodal_top = function() {
 var windowHeight = $(window).height();
    var modalHeight = $('#eModal-1').outerHeight();
    var modalTop = Math.round((windowHeight - modalHeight) / 3);
    if (modalTop <= 0) {
      modalTop = 0;
    }

    $('#eModal-1').css('top', modalTop);
 }
  jQuery(function($){
  $( "#call-me" ).click(function() {
  $('eModal-1').bind('emodalAfterOpen', function() { alert('Reposition');reposition(); });
 });

How can I use the callback ’emodalAfterOpen’? Is this a correct way to set its custom position?

https://www.ads-software.com/plugins/easy-modal/