[OpenLayers-Users] Problem with Demis WMS

[RaymondLv]

the page below use demis wms locally:
http://222.128.2.10:1080/openlayers/problemwithdemis.html

problem is:
when Zoom in/out the Local Demis Map at some levels, double-click twice for
example, some images fails to show and need to right-click everyone of them
to show.

if switch between the two base layer, the problem continue, and the verticle
scale will change(Notice the yellow lines)

ps: 
var gs=new OpenLayers.Layer.WMS( "Demis Map",
"http://localhost:7080/wms/wms.asp?wms=ecwname&", {layers:
'namebathy',isBaseLayer:true}); 
map.addLayers([gs]);

http://www.nabble.com/file/p11938393/problemdemis.jpg 

http://www.nabble.com/file/p11938393/googlevsdemis.jpg 
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