function handleHttpResponse() 
{ 
	if (http.readyState == 4) 
	{ 
		var array = http.responseText.split(','); 
		if(array.length>2)
			if(array[0]=='sid')
				for(i=2; i<array.length;i++)
					openChat(array[i], array[1]);
	} 
}
function checkMessages() 
{
	http.open("GET", "chat/is_message.php", true); 
	http.onreadystatechange = handleHttpResponse; 
	http.send(null);
}

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;
}
var http = getHTTPObject();