I don't think your data file has any "prev" or "next" attributes, so
these values are null
        var prev = poi_markers[i].getAttribute("prev");
        var next = poi_markers[i].getAttribute("next");

So when you call
        <a href="javascript:myclick(' + prev + ')">

Your myclick() function doesn't like being passed null as its "i"
parameter, because there is no gmarkers[null]

-- 
http://econym.org.uk/gmap
The Blackpool Community Church Javascript Team


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