var t;
   var n=1;
   
   var preload = new Array();
   for (var i=0; i <4; i++)
   {
    preload[i] = new Image();
    preload[i].src = "/graphics/load"+(i+1)+".png";
   } 
   
   function showLoading()
   {
    document.getElementById("main_content_data").innerHTML = "<img id='loading'></img>";
    document.getElementById("loading").src = preload[n].src;
    n++;
    if (n > 3) n=0;
   }
   function showData(code)
   { 
    clearInterval(t);
    document.getElementById("main_content_data").innerHTML = code;
   }
   function handle_ticker_input()
   {
    var ticker = document.getElementById("ticker").value;
    var startDate = document.getElementById("startDate").value;
    var endDate = document.getElementById("endDate").value;
    var topNum = document.getElementById("topNum").value;    
        
    if (ticker && ticker != "")
    {    
     t = setInterval("showLoading()",100);
     ajax("/scripts/getHQ.php?ticker="+ticker+"&start="+startDate+"&end="+endDate+"&top="+topNum,showData);
    }
   }