Multiple instances of CKEditor & image uploads

Hi,

I have got a single instance of CKEditor working with a custom image uploader that i have built using asp. When the image is uploaded i call

window.top.opener.CKEDITOR.tools.callFunction(2, encodeURI( '<%=(tblSystemInfo.Fields.Item("webAddress").Value)%>/Images/Uploads/<%=Session("uploadedFileName")%>' ).replace( '#', '%23' ));
window.top.close() ;
window.top.opener.focus() ;

to load the image i have uploaded into the image URL field. This works great, however, when I have multiple instances of CKEditor on the same page, only the first instance works, the others result in a javacript error on the parent page after uploading the image.

The error is _.filebrowserSe is null or not an object (line 54 character 1059 of ckeditor.js)

Does anyone have any suggestions?

Thanks in advance

Jason