function GetXmlHttpObject()
{
    var xmlHttp=null;
    try{
      // Firefox, Opera 8.0+, Safari
      xmlHttp=new XMLHttpRequest();
    }catch (e){
        // Internet Explorer
        try{
            xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
        }catch (e){
            xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
    }
    return xmlHttp;
}

function insertAfter(newChild, refChild) { 
 refChild.parentNode.insertBefore(newChild,refChild.nextSibling); 
} 

function insertBefore(newChild, refChild) { 
 refChild.parentNode.insertBefore(newChild,refChild); 
} 


function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}