jQuery(document).ready(function() {

	var formfield;

	/* user clicks button on custom field, runs below code that opens new window */
	jQuery('#upload_file_button').click(function() {
		formfield = jQuery('#upload_file').attr('name');
		tb_show('','media-upload.php?TB_iframe=true');

		return false;

	});

	// user inserts file into post. only run custom if user started process using the above process
	// window.send_to_editor(html) is how wp would normally handle the received data

	window.original_send_to_editor = window.send_to_editor;
	window.send_to_editor = function(html){

		if (formfield) {
			fileurl = jQuery(html).attr('href');
	
			if(fileurl!=null) {
				fileurl = jQuery(html).attr('src');
			}
			jQuery('#' + formfield).val(fileurl);

			tb_remove();
		} else {
			window.original_send_to_editor(html);
		}
	};

});