http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1155msg4448;topicseen#msg4448

made a nice applet from this one as original model!
check it out.[img]http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=1155.0;attach=1184;image[/img]
i like it :)