// here we define global variable
var ajaxdestination="";

function getData(what,where,letter,selectedTartanID,action) { // get data from source (what)
	
 try {
   xmlhttp = window.XMLHttpRequest?new XMLHttpRequest():
  		new ActiveXObject("Microsoft.XMLHTTP");
  	
 }
 catch (e) { /* do nothing */ }

 document.getElementById(where).innerHTML ="<center><img src='images/loadinga.gif' style='margin-top:60px;'></center>";
// we are defining the destination DIV id, must be stored in global variable (ajaxdestination)

 ajaxdestination=where;
 xmlhttp.onreadystatechange = triggered; // when request finished, call the function to put result to destination DIV

 xmlhttp.open("GET", what+'?selectedLetter='+letter+'&action='+action+'&tartanID='+selectedTartanID);
 xmlhttp.send(null);
  return false;
}

function triggered() { // put data returned by requested URL to selected DIV
  if (xmlhttp.readyState == 4) if (xmlhttp.status == 200) 
    document.getElementById(ajaxdestination).innerHTML =xmlhttp.responseText;
}