Demo of WP media uploader in metabox

gistfile1.js

jQuery(function($) {

  var element_clicked = false;
  
  $('#my-button').click(function() {
    formfield = jQuery('#my-button').attr('name');
    tb_show('', 'media-upload.php?type=image&TB_iframe=true');
    element_clicked = true;
    return false;
  });
  
  // Store original function
  window.original_send_to_editor = window.send_to_editor;
  
  /**
  * Override send_to_editor function from original script
  * Writes URL into the textbox.
  *
  * Note: If header is not clicked, we use the original function.
  */
  window.send_to_editor = function(html) {
    if (element_clicked) {
      imgurl = $('img',html).attr('src');
      // do stuff here with the URL
      element_clicked = false;
      tb_remove();
    } else {
      window.original_send_to_editor(html);
    }
  }
});