[HaseProgram]

function loadXMLDoc() {
var xmlhttp;
if (window.XMLHttpRequest) {
  xmlhttp=new XMLHttpRequest();
  }
else {
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
    }
  }
var params = 'http://www.google.com/';
xmlhttp.open("POST","https://www.googleapis.com/urlshortener/v1/url",true);
xmlhttp.setRequestHeader("Content-Type", "application/JSON");
xmlhttp.send(params);
}
loadXMLDoc();

Может быть так?