Iframe Location Change Shows Continuous Progress Bar in IE6 Status Bar

I've set up a page with an iframe on it that has its src property changed by hyperlinks that call a javascript function. The problem I am running into is that periodically, when the hyperlink is clicked, the src does change and brings back the fully rendered page, but the progress bar in IE6's status bar continues to churn, as if it is still processing the page. The funny thing is if you immediately click the link again, the progress bar completes. Also, sometimes when clicked once, the progress bar completes; other times it continues to churn. Has anyone come across this behavior and found a fix?

Below is the javascript function:

function showDetail(dateColumn) {
      iframe_url += 'iframepage.cfm?datecolumn=' + dateColumn;
      document.getElementById('iframe_report_detail').src = iframe_url;
}