title: ExtJS, IE7 form submission problem
body: <p>I have an ExtJS form panel defined using the 'form' xtype. When the user clicks submit this form's url is changed based on which page they are on. It is a file upload form. In IE7 the url parameter is completely ignored and the returned string is the HTML from the root of the website. In IE8, FF, and Chrome this works perfectly fine.</p>
  
  <p>Is there some kind of security setting or something else I should be looking for? The URL parameter seems to be completely ignored resulting in a failed file upload.</p>
  
  <p>Form Code (Form is in a window):</p>
  
  <pre><code>items: [{
              xtype: 'form',
              fileUpload: true,
              baseCls: 'x-window',
              bodyStyle: 'font-family:tahoma;font-size:12px;',
              defaults: {
                  bodyStyle: 'font-family:tahoma;font-size:12px;',
                  width: 200
              },              
              items: [{
                  xtype: 'hidden',
                  name: 'action',
                  value: 'import'
              }, {
                  xtype: 'fileuploadfield',
                  fieldLabel: 'Import File',
                  name: 'uit'
              }]
          }],
          fbar: [{
              text: 'Import',
              handler: this.handleImportFn,
              scope: this
          }, {
              text: 'Cancel',
              handler: function () {
                  var myB = this;
                  myB.disable();
                  this.ownerCt.ownerCt.hide();
                  myB.enable();
              }
          }]
  </code></pre>
  
  <p>Form Submission:</p>
  
  <pre><code>            form.submit({
              params: {
                  id: id
              },
              url: this.superParent.myBasicURL // This has been verified valid,
              waitMsg: 'Uploading file',
              success: function (form, action) {
                  var resp = Ext.decode(action.response.responseText),
                      addSucc = resp.addSucc || false,
                      msg = 'Import completed successfully.';
  
                  if (addSucc) {
                      if (typeof resp.skipped !== 'undefined' &amp;&amp; resp.skipped &gt; 0) {
                          msg += "  " + resp.skipped + " records skipped [" + resp.skips + "].";
                      }
                      Ext.MessageBox.alert("Info", msg);
                      myStore.load();
                      myWin.hide();
                  }
                  else {
                      Ext.MessageBox.alert("Error", resp.error);
                  }
              },
              failure: function (form, action) {                  
                  switch (action.failureType) {
                      case Ext.form.Action.CLIENT_INVALID:
                          Ext.Msg.alert('Failure', 'Form fields may not be submitted with invalid values');
                          break;
                      case Ext.form.Action.CONNECT_FAILURE:
                          Ext.Msg.alert('Failure', 'Ajax communication failed');
                          break;
                      case Ext.form.Action.SERVER_INVALID:
                          Ext.Msg.alert('Failure', action.result.error);
                          break;
                  }
              }
          });
  </code></pre>
  
  <p>Thanks...</p>