fix error

@@ -11,7 +11,7 @@ var file_upload_limit = 6;
 $.fn.extend({
     qupload: function(options) {
         writeProgressHtml();
-        initSwfUpload($(this).attr('id'), options);
+        initSwfUpload.call(this, $(this).attr('id'), options);
     }
 });
 
@@ -35,6 +35,8 @@ function setUploadStatus(uploadNum, totalUploadNum) {
 
 // 初始化swf
 function initSwfUpload(btnId, options) {
+    var that = this;
+
     // 上传成功的回调函数
     var uploadSuccessCallBack = null;
     if (options.uploadSuccessed != undefined) {
@@ -65,15 +67,15 @@ function initSwfUpload(btnId, options) {
     // 当前已经上传的张数
     var curUploadedNum = 0;
 
-    this.options = options;
+    that.options = options;
 
     var numTest = 0;
 
-    var errmsg_box = this.options.errmsg_box;
+    var errmsg_box = that.options.errmsg_box;
 
     // 设置默认值函数
     function setDefaultValue(optionName, optionValue) {
-        this.options[optionName] = options[optionName] == undefined ? optionValue
+        that.options[optionName] = options[optionName] == undefined ? optionValue
                 : options[optionName];
     }
 
@@ -98,16 +100,16 @@ function initSwfUpload(btnId, options) {
     setDefaultValue('button_cursor', '-2');
 
     var settings = {
-        flash_url: this.options.flash_url,
-        upload_url: this.options.upload_url,
-        file_post_name: this.options.file_post_name,
+        flash_url: that.options.flash_url,
+        upload_url: that.options.upload_url,
+        file_post_name: that.options.file_post_name,
 
         // post_params: {"PHPSESSID" : "<?php echo session_id(); ?>"},
-        file_size_limit: this.options.file_size_limit,
-        file_types: this.options.file_types,
-        file_types_description: this.options.file_types_description,
-        file_upload_limit: this.options.file_upload_limit,
-        file_queue_limit: this.options.file_queue_limit,
+        file_size_limit: that.options.file_size_limit,
+        file_types: that.options.file_types,
+        file_types_description: that.options.file_types_description,
+        file_upload_limit: that.options.file_upload_limit,
+        file_queue_limit: that.options.file_queue_limit,
         prevent_swf_caching: false,
         preserve_relative_urls: false,
         custom_settings: {
@@ -116,16 +118,16 @@ function initSwfUpload(btnId, options) {
         debug: false,
 
         // Button settings
-        button_image_url: this.options.button_image_url,
-        button_width: this.options.button_width,
-        button_height: this.options.button_height,
+        button_image_url: that.options.button_image_url,
+        button_width: that.options.button_width,
+        button_height: that.options.button_height,
         button_placeholder_id: btnId,
-        button_text: this.options.button_text,
-        button_text_style: this.options.button_text_style,
-        button_text_left_padding: this.options.button_text_left_padding,
-        button_text_top_padding: this.options.button_text_top_padding,
-        button_window_mode: this.options.button_window_mode,
-        button_cursor: this.options.button_cursor,
+        button_text: that.options.button_text,
+        button_text_style: that.options.button_text_style,
+        button_text_left_padding: that.options.button_text_left_padding,
+        button_text_top_padding: that.options.button_text_top_padding,
+        button_window_mode: that.options.button_window_mode,
+        button_cursor: that.options.button_cursor,
 
         // The event handler functions are defined in handlers.js
         file_dialog_start_handler: fileDialogStart,
@@ -138,8 +140,8 @@ function initSwfUpload(btnId, options) {
         upload_success_handler: uploadSuccess,
         upload_complete_handler: uploadComplete,
         queue_complete_handler: queueComplete,
-        button_action: this.options.button_action,
-        post_params: this.options.post_params
+        button_action: that.options.button_action,
+        post_params: that.options.post_params
     };
 
     var swfu = new SWFUpload(settings);