[woodwood]

Ah I was confused myself, you're right, thanks anyhow...
Your possible solution only works when there's a fixed number of calls running simultaneously... I fixed it differently though:

- I made var xobject refer to a different (global) object in the getXMLObject() function.
- The var xobject is now called inside the handler function

var time_variable;
 
function getXMLObject()  //XML OBJECT
{
   var gobject = false;
   try {
     gobject = new ActiveXObject("Msxml2.XMLHTTP")  // For Old Microsoft Browsers
   }
   catch (e) {
     try {
       gobject = new ActiveXObject("Microsoft.XMLHTTP")  // For Microsoft IE 6.0+
     }
     catch (e2) {
       gobject = false   // No Browser accepts the XMLHTTP Object then false
     }
   }
   if (!gobject && typeof XMLHttpRequest != 'undefined') {
     gobject = new XMLHttpRequest();        //For Mozilla, Opera Browsers
   }
   return gobject;  // Mandatory Statement returning the ajax object created
}
	

function handler(div) {

	var xobject = new getXMLObject();
	var randint = Math.random();
	var getdate = new Date();
		
		xobject.open("POST",phpFile,true);
		xobject.onreadystatechange  = function() {
			if (xobject.readyState==4) {
				if(xobject.status == 200) {
					document.getElementById(div).innerHTML=xobject.responseText;
				}
				else {
					alert('error');
				}
			}
		}
		xobject.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		xobject.send(postVars);
	} 


function showdiv1() {
  	divID = "div1"; //define html div
  	phpFile = "showdiv1.php"; //define file to be loaded
  	postVars = "var1=somevalue"; //define post vars
  	handler(divID);
}

function showdiv2() {
  	divID = "div2"; //define html div
  	phpFile = "showdiv2.php"; //define file to be loaded
  	postVars = "var2=somevalue"; //define post vars
  	handler(divID);
}

function showdivs() {
showdiv1();
showdiv2();
}