Convert Image to base64

[mandra]

Dear Masters,

Currently I am using Filemaker pro 9. It has limited function to convert image to base64 (blob). As I know there are script on scriptmaster that can do convert image to base 64. I already try it but no luck. I copy the record of "Base 64 Encode"  and change the script become "return new sun.misc.BASE64Encoder().encode( fmpro.getContainerStream( textToEncode ).getBytes() );" and the key parameter is "textToEncode" and the value I change become container and insert some picture in it. But when I press the Run button the encoded text are mentioning the filename of the picture that I inserted. 

Did I missing something or make some mistake ?

Please give me enlightment. 

Thanks

Mandra