Appendchild nefunguje v IE8

if(document) if(!document.getElementsByClassName)
document.getElementsByClassName = function(cl) {
  var retnode = [];
  var myclass = new RegExp('\\b'+cl+'\\b');
  var elem = document.getElementsByTagName('*');
  for(var i=0; i<elem.length; i++) {
    var classes = elem[i].className;
    if(myclass.test(classes)) retnode.push(elem[i]);
  }
  return retnode;
}

if ( !Array.prototype.forEach ) {
  Array.prototype.forEach = function(fn, scope) {
    for(var i = 0, len = this.length; i < len; ++i) {
      fn.call(scope, this[i], i, this);
    }
  }
}

 function sortOut(frequency) {
    var wrap = document.getElementById("offer-list");
    var classname = document.getElementsByClassName('offer-item');
    var divs = [];
    for (var i = 0; i < classname.length; ++i) {
        divs.push(classname[i]);
    }
    
    var freq = "data-price-" + frequency;

    divs.sort(function(a, b) {
    return +a.getAttribute(freq) - +b.getAttribute(freq);
    });
    divs.forEach(function(el) {
    wrap.appendChild(el); // TOHLE DĚLÁ TEN BORDEL!!
    });   
}                                 

   
$(document).ready(function(){
sortOut(frequencyValue);
});

new RegExp("(^|\s)" + cl+ "(\s|$)");

var classname = wrap.childNodes;

return +a.getAttribute(freq) - +b.getAttribute(freq);

var myclass = new RegExp("(?:^|\\s)" + cl+ "(?:$|\\s)");

  
  $(function() {
        $("#date").datepicker({
            changeMonth: true,
            changeYear: true,
            maxDate: "-18Y",
            yearRange: "1900:2100",  //tady mu vadí ta poslední čárka (zřejmě), jinak na té simulaci IE8 si z toho vůbec nic nedělá..
     
        });
    });