function showPreview(opt_divId, opt_prv) {
   if(!opt_divId || !opt_divId.length) return true;
   if(!opt_prv || opt_prv < 1) return true;


   var pv = document.getElementById(opt_divId);
   if(!pv) return false;


   var pv_url = '<p style="text-align: center;">Please be patient while preview loads (requires flash)...</p>';
   var pv_url = pv_url + '<object width="440" height="450"><param name="movie" value="http://www.lulu.com/viewer/embed/EmbeddablePreviewer.swf?version=20100511132433"></param><param name="wmode" value="transparent"></param><param name="allowFullScreen" value="true"></param><param name="allowScriptAccess" value="always"></param><param name="flashvars" value="contentId=' + opt_prv + '&endpoint=http://www.lulu.com/author/previews/preview_endpoint.php"></param><embed src="http://www.lulu.com/viewer/embed/EmbeddablePreviewer.swf?version=20100511132433" flashvars="contentId=' + opt_prv + '&endpoint=http://www.lulu.com/author/previews/preview_endpoint.php" type="application/x-shockwave-flash" allowFullScreen="true" wmode="transparent" allowScriptAccess="always" width="440" height="450"></embed></object>';

   pv_url = pv_url + '<p style="text-align: center;"><a href="#" onclick="hidePreview(\'' + opt_divId + '\');">Close Preview</a></p>';
   pv.innerHTML = pv_url;
   pv.innerHTML = pv.innerHTML;

}

function hidePreview(opt_divId) {
   if(!opt_divId || !opt_divId.length) return false;

   var pv = document.getElementById(opt_divId);
   if(pv) {
      pv.innerHTML = '';
      pv.innerHTML = pv.innerHTML;
   }
}