function getXmlHttp() {
       var xmlhttp;
       try {
       xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
       }catch (e){
       try {
       xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
       }catch (E){
       xmlhttp = false;
       }
    }
    if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
    xmlhttp = new XMLHttpRequest();
    }
    return xmlhttp;
}
 
   function lol(id) {
   var xmlhttp = getXmlHttp();
   xmlhttp.open('GET', 'profile.php?id=' + id, false);
   xmlhttp.send(null);
      if (xmlhttp.status == 200) {
      var response = xmlhttp.responseText;
      document.getElementById('prof1').innerHTML = response;
      var ava = 'img/people/' + id+'.jpg';
      document.location.href = '#profile';
      }
   };

<div class='ch-item' style='background-image: url( место1 ); width: 80%; background-size: cover;'></div>

document.querySelector('.ch-item').style.backgroundImage = ava;

( function () {

  var factories = [
    function () { return new ActiveXObject("Msxml2.XMLHTTP"); },
    function () { return new ActiveXObject("Microsoft.XMLHTTP"); },
    function () { return new XMLHttpRequest(); }
  ];
  var XHR;

  while ( XHR = factories.shift()) {
    try { XHR(); window.XHR = XHR; return; }
    catch ( e ) {}
  }

})();

$('.ch-item').css('background-image','url('+ava+')')