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I want to draw circles on maps with different colours, this gives the signal strength of the tower, suppose circle is of 50 m then first 20m should be given a color1 and next 20 m color2 and remaining color3.

Is this possible in Geoserver SLD or openlayers? How?

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I think you might google ringed buffer if you don't get a response that helps. – Brad Nesom Jun 3 '11 at 10:46
Here you go: – CaptDragon Jun 3 '11 at 13:28
up vote 4 down vote accepted

Look at that! Someone has already asked for drawing circles and it has already been answered.

Regarding colors, you should use OpenLayers.Style(); and have a look on OL doc and eventually on the wiki page.

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