Why isn't it the same with canvas, and webgl renderer? (three.js)

I try to render a sphere with three.js, but if I render it with canvasRenderer, then there are grey lines on the sphere

code: http://jsfiddle.net/jzpSJ/

screenshot: http://desmond.imageshack.us/Himg209/scaled.php?server=209&filename=canvase.png&res=landing

But if I render it with webGL renderer in opera next, then it looks awful

code: http://jsfiddle.net/jzpSJ/1/

screenshot: http://desmond.imageshack.us/Himg51/scaled.php?server=51&filename=webglopera.png&res=landing

In google chrome it looks as it should be.

Thanks in advance,

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