jQuery media uploader in wp-admin

Hi.

Im using the built in thickbox to upload files for my cycle plugin in a custom meta box. I have multiple fields, but if i upload and insert in one field – it gets input’ed into all of the fields.

HTML:
	<label>
		Bild:
		<br />
		<input type="text" class="imagecycle_image" name="imagecycle0[image]" value="" size="35" />
  		<input class="upload_image_button" value="Get image" type="button" onclick="myMediaPopupHandler();" />
	</label>

jQuery:

function myMediaPopupHandler()
{
	var formfield;
	window.send_to_editor = function(html) {
			fileurl = jQuery('img',html).attr('src');
			formfield.val(fileurl);
			tb_remove();
	}
	formfield = jQuery('.upload_image_button').prev('input');
	tb_show('', 'media-upload.php?type=image&tab=library&TB_iframe=true');
	return false;
}

So I have multiple instances of the uploading fields (gets added via javascript), and if i choose to upload for field 1, the result gets inputed into all fields. It seems like the prev(‘input’) part does not work.. Please help!