SVG->PNG, background tranparency problem. Help please

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I know this is an old question, I did try to search the answers and tried a lot, but I still can not figure it out. Could anyone give me a hint?   I have a very small SVG file, which has a freehand path. [http://www.dynazone.com/SVG/svg5.svg] I did the following to produce a PNG file called svg5.png [http://www.dynazone.com/SVG/svg5.png]       java -jar batik-resterizer.jar svg5.svg   But after I create the webpage with that svg5.PNG file, I put it on top of my testing webpage, and browse it with IE 6. I found its background is not transparent at all. [http://www.dynazone.com/SVG/movingNotTransparent.htm]   I tried different approaches, but all failed: 1) java -jar batik-resterizer.jar -bg 0.0.0.0 svg5.svg  --- failed 2) Change the PNGTranscoder.java, change variable "a" to 0. a is alpha channel value. --- failed again ... ... Now matter what I have tried, the background of the generated PNG file was either all black or all white, but never transparent.(I am new to Image processing, maybe something above I did is not in correct way. Correct me please. )   After some search, I found some PNG files got from somewhere else could work very well with my test page. [http://www.dynazone.com/SVG/movingTransparent.htm]   So, Can anyone give me some suggestion how I can convert my svg5.svg to a svg5.PNG with transparent background with Batik?     Thanks a lot, Leo