$(document).ready(function () {
    var info_slide_obj = jQuery('#infobaner_realizujemy');
    var theWindow = jQuery(window);
    var windowWidth = theWindow.width();
    var windowHeight = theWindow.height();  

    var X2 = (windowWidth - 400)/2;
    var Y2 = (windowHeight - 40)/2;
    X2 = X2 + "px";
    Y2 = Y2 + "px"; 
    info_slide_obj.css({
      'left':X2
    });   

    $("#infobaner_realizujemy").show();



});