Div over Iframe

Hello,

I'm having great difficulty showing a div layer over an embedded iframe,

Basically, the div's i want to show are small little helper boxes.

They are hidden until an icon is clicked

This is the div

<div id="help_local" class="info_box" style="display:none; z-index: 50;" onmouseover="showInfo('icon_local','help_local');" onmouseout="hideInfo('help_local');"><b>Local Rank</b><br />This column shows the frequency rank of search queries relative to the average of the highest performing search queries matching your keywords.</div>

This will show up over the page when clicked, by setting display to block

On the page itself... i have a list of results, with a little icon next to each result. When the icon is clicked, it dynamically appends a div to the bottom of the cell and then injects an iframe into that div to display some historical data. This works great, but when i try to display the div above, over the iframe, it cuts off.

My injection code is as follows:

function showHistory(id, query) {
        
        var container_row = "hist_cont" + id;
        var container_div = "hist_chart" + id;
        
        clearTimeout(timer_history);
        
        if (last_history !== container_div) {
          
      closeHistory();
     
          var id_div = document.getElementById(container_div);
        
          if (id_div) {
          
            var container_frame = container_div + "frame";
            var id_frame = document.createElement(container_frame);
          
            id_frame.setAttribute("id", container_frame);
            id_frame.innerHTML = showChart(query);
          
            id_div.appendChild(id_frame);
            id_div.style.display = "block";
          
            last_history = container_div;
                
          }
          
        } else {
          
          closeHistory();
          
        }
        
      }

  function showChart(chart_query) {
   
    var chart_rnd = Math.floor(Math.random() * (2147483647 + 1)) + 1;
    var chart_url = "chart/index.php?query=" + chart_query + "&height=160&rand=" + chart_rnd;

    var chart_html  = "<table width=\"100%\">\n";
        chart_html += " <tr><td>\n";
        chart_html += "   <iframe style=\"display:inline; z-index:1;\" frameborder=\"0\" height=\"160\" width=\"100%\" marginheight=\"0\" marginwidth=\"0\" id=\"frame\" scrolling=\"no\"  src=\"" + chart_url + "\">";
        chart_html += " </td></tr>\n";
        chart_html += "</table>";
       
    return chart_html;
       
  }

Now no matter what i do, with z-index, i can't get the div to display over the iframe, i've tried setting the z-index of the iframe, of the containing div around the iframe... and it doesn't make any difference.

Even when the iframe is position: absolute (which i've read somwhere) it doesn't work.

The site is http://search.searchers.co.uk/forensics/?query=london

Any ideas would be helpful.
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