Hi, As an easy solution I would do it like this...
1.Using desktop opensource-gis (or ESRI ArcGIS if you have it), import from the excel sheet and export as shapefile making sure the Diameter is saved in a field. 2. Install geoserver on your webserver and upload the shp into a store(http://geoserver.org/display/GEOS/Download) 3. create an "attribute based poin " SLD which renders the size of the point according to it´s diameter(http://docs.geoserver.org/stable/en/user/styling/sld-cookbook/points.html) 4. use Openlayers.js to simply create a map and show the dataset.(http://openlayers.org/QuickTutorial/) Hope this helps, Robert Buckley
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