problem with media library custom widget

Hi

As part as a widget im creating i need the admin to upload an image via the widgets panel
I have the following code under a new class

function form($instance)
  {
   $instance = wp_parse_args( (array) $instance, array( 'qrimage'=> '');
   $qrimage=$instance['qrimage'];

<label for="<?php echo $this->get_field_id('qrimage'); ?>">Upload QR Image:
       <input class="widefat" id="<?php echo $this->get_field_id('qrimage'); ?>" name="<?php echo $this->get_field_id('qrimage'); ?>" type="text"              value='<?php echo attribute_escape($qrimage); ?>' />

Upload Image <label for="uploadi<?php echo $this->get_field_id('qrimage'); ?>"> 

<input class="uploadi<?php echo $this->get_field_id('qrimage'); ?>" name="uploadi<?php echo $this->get_field_id('qrimage'); ?>"         id="uploadi<?php echo $this->get_field_id('qrimage'); ?>" vlue="Upload Image" type="button" /> 

</label>

<script type="text/javascript">
      var formfield = '';
      var imgurl ='';
      jQuery(document).ready(function() {
        jQuery('.uploadi<?php echo $this->get_field_id('qrimage'); ?>').click(function() {
         formfield = jQuery('#<?php echo $this->get_field_id('qrimage'); ?>').attr('name');
         tb_show('', 'media-upload.php?type=image&amp&TB_iframe=1');
         return false;
        });

        // send url back to plugin editor
        window.send_to_editor = function(html) {
         imgurl = jQuery('img',html).attr('src');
         jQuery('#<?php echo $this->get_field_id('qrimage'); ?>').val(imgurl);
         tb_remove();
        }

        });
  </script>

thing is… if i have 1 instance of the widget on the widgets panel , everything works fine.

Once i add another instance, everything’s working except the option to save the image…

The text field gets the link but on save it just disappears

Any thoughts why ?

Thanks