jQuery Console Log

jQuery(document).ready(function() {

    jQuery('.upload_image_button').click(function() {
         targetfield = jQuery(this).prev('.upload_image');
     targetimg = jQuery(this).prev('.preview_image');
         tb_show('Choose Image', 'media-upload.php?type=image&TB_iframe=true');
     console.log(this);
     console.log(jQuery(this).prev('.preview_image'));
     window.old_ste = window.send_to_editor;
         return false;
    });

    window.send_to_editor = function(html) {
         imgurl = jQuery('img',html).attr('src');
         jQuery(targetfield).val(imgurl);
     jQuery(targetimg).attr('src',imgurl);
         tb_remove();
     window.send_to_editor = window.old_ste;
    }
});
// Console Log
// <input type="button" value="Upload Image" class="upload_image_button"> my-script.js:7
// Object { length: 0, prevObject: Object, context: <input.upload_image_button> }

// HTML
// <img class="preview_image" style="max-height: 150px;" src="<?php echo esc_attr( get_option('image-'.$page->post_name ) ); ?>">
// <input class="upload_image" type="hidden" size="60" name="image-<?=$page->post_name;?>" value="<?php echo esc_attr( get_option('image-'.$page->post_name ) ); ?>" />
// <input class="upload_image_button" type="button" value="Upload Image" />