Electric field lines generated by one positive and one negative charges applet

i copy n paste from the html and removed the spaces, it can't run, any idea why?  Grin
it seem to work when i click on this link ?
http://home.phy.ntnu.edu.tw/~lookang/Physletbuilder/Efieldgeneratedbyonepositiveandonenegativecharge01.html
name="AppletNames" value="Efield">






reference: prof hwang's code





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