title: Plupload, dynamically change url
body: <p>I have an upload form with plupload and a checkbox with boolean value after the plupload div.</p>
  
  <p>I want to change the value of the url in plupload if the checkbox is checked.</p>
  
  <p>Here is my code</p>
  
  <pre><code>&lt;div id="uploader"&gt;
      &lt;p&gt;You browser doesn't have Flash, Silverlight, Gears, BrowserPlus or HTML5 support.&lt;/p&gt;
  &lt;/div&gt;
  &lt;input id="compressFiles" type="checkbox" name="compressFiles" style="margin:10px 0 0 10px;" value="compress" checked="checked" /&gt; 
  
  $(function() {
  
  $("#compressFiles").change(function(){
      if( $("#compressFiles").is(':checked') ){
              compress = 'compress';
         }
         else{
          compress = 'no';
         }
  })
  
  $("#uploader").plupload({
  
      runtimes : 'gears,flash,html5,html4,browserplus,silverlight',
      url: 'uploadHandler.php?compressFiles=' + compress,
      max_file_size : '1000mb',
      max_file_count: 20, // user can add no more then 20 files at a time
      unique_names : true,
      dragdrop : true,
      multiple_queues : true,
  
      // Addeb by LG - problem with FF
      filters: [
          {title: "All", extensions: "*"}
      ],
  
      // Rename files by clicking on their titles
      rename: true,
  
      // Sort files
      sortable: true,
  
      // Flash settings
      flash_swf_url : 'js/plupload.flash.swf',
  
      // Silverlight settings
      silverlight_xap_url : 'js/plupload.silverlight.xap',
      init : {
          FilesAdded: function(up) {
               if( $("#compressFiles").is(':checked') ){
                  compress = "no"
               }
               else{
                   compress = "no"
               }
      }
      }
  
  });
  
  // Client side form validation
  $('form').submit(function(e) {
      var uploader = $('#uploader').plupload('getUploader');
  
      // Validate number of uploaded files
      if (uploader.total.uploaded == 0) {
          // Files in queue upload them first
          if (uploader.files.length &gt; 0) {
              // When all files are uploaded submit form
              uploader.bind('UploadProgress', function() {
                  if (uploader.total.uploaded == uploader.files.length){ alert("coucou");
                      $('form').submit();}
              });
  
              uploader.start();
          } else
              alert('You must at least upload one file.');
  
          e.preventDefault();
      }
  });
  
  });
  </code></pre>
  
  <p>The value of url variable is defined first time page load with compress value. I tried 1000 thinhs but impossible to refresh the compress value in the url when checkbox change.</p>
  
  <p>I hope my problem is clear, dont speak english very good.</p>
  
  <p>Thanks for help</p>