function handleHttpResponse() {
  if (http.readyState == 4) {
		document.getElementById('snapshot').innerHTML = http.responseText;
		processingOff();
  }
}

function getHTTPObject() {
  var xmlhttp;
  /*@cc_on
  @if (@_jscript_version >= 5)
    try {
      xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (E) {
        xmlhttp = false;
      }
    }
  @else
  xmlhttp = false;
  @end @*/
  if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
    try {
      xmlhttp = new XMLHttpRequest();
    } catch (e) {
      xmlhttp = false;
    }
  }
  return xmlhttp;
}

function getLBSel(strListBox) {
	selectedItem = document.getElementById(strListBox);
	itemId = selectedItem.options[selectedItem.selectedIndex].id;
	return itemId;
}

function changeTopic(strFile) {
	// Populate the areas of the page based on the combo selection
	//first Put Up Processing Symbol
	

	processingOn();
 	http.open("GET", strFile, true); // + escape(zipValue)
  	http.onreadystatechange = handleHttpResponse;
  	http.send(null);

}

function processingOn() {
 document.getElementById('waitIcon').src = "/es_mx/Images/wait_icon_wait_tcm903-28637.gif";
}

function processingOff() {
 document.getElementById('waitIcon').src = "/es_mx/Images/wait_icon_nowait_tcm903-28636.gif";	
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		lch_s = newImage("/es_mx/Images/wait_icon_nowait_tcm903-28636.gif"); //static image
		lch_a = newImage("/es_mx/Images/wait_icon_wait_tcm903-28637.gif");  //animated wait state
		preloadFlag = true;
	}
}
var http = getHTTPObject();