[OpenLayers-Dev] error of "arg: fraction out of range"

[dequan chen]

hi all,

i use OL as client map tools. tilecache as map layer. map layer add new
marker and remove old marker per second.
and at this time, when i zoom in, out and pan the map many times, it show
the script error:
**
*line: 709*
*error: Arg: Fraction out of range (0 to 1 allowed)*

i suspect it is relate to the client OS. because when i zoom in ou and pan
the map,it responses very slow.
i just guess. but i do not know what is the real cause.
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