<div dir="ltr">You need to pass the transparent=true to the wms by placing it in the first part of the constructor instead of the second so something like:<div><br></div><div><span style="font-family:arial,sans-serif;font-size:13px">var wms1 = new OpenLayers.Layer.WMS(</span><br style="font-family:arial,sans-serif;font-size:13px">
<span style="font-family:arial,sans-serif;font-size:13px">    layername,</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">    wmsname, {</span><br style="font-family:arial,sans-serif;font-size:13px">
<span style="font-family:arial,sans-serif;font-size:13px">        layers: layername,</span></div><div><span style="font-family:arial,sans-serif;font-size:13px">        styles: 'Default',</span><span style="font-family:arial,sans-serif;font-size:13px">        </span></div>
<div><span style="font-family:arial,sans-serif;font-size:13px">        transparent: true,</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">        format: "image/png",</span><span style="font-family:arial,sans-serif;font-size:13px"><br>
</span></div><div><span style="font-family:arial,sans-serif;font-size:13px">        version: '1.3.0'</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">    }, {</span><br style="font-family:arial,sans-serif;font-size:13px">
<span style="font-family:arial,sans-serif;font-size:13px">        </span><span style="font-family:arial,sans-serif;font-size:13px">wrapDateLine: true,</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">        opacity: opacitywms1,</span><br style="font-family:arial,sans-serif;font-size:13px">
<span style="font-family:arial,sans-serif;font-size:13px">        transitionEffect: 'resize'</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">    });</span><br>
</div><div><span style="font-family:arial,sans-serif;font-size:13px"><br></span></div><div style><font face="arial, sans-serif">Ian</font></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On 7 February 2013 09:49, pascal <span dir="ltr"><<a href="mailto:pascal2833@gmail.com" target="_blank">pascal2833@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
I try to overlay wms layers which have continental data to wms layers which<br>
have coastal data. The problem is that where they don't have to have data<br>
(for example in the sea for continental wms), they are white and if the<br>
opacity of continental and coastal wms is 1, we can't superpose them.<br>
I set these 2 wms to transparent, like that :<br>
<br>
var wms1 = new OpenLayers.Layer.WMS(<br>
    layername,<br>
    wmsname, {<br>
        layers: layername,<br>
        version: '1.3.0'<br>
    }, {<br>
        styles: 'Default',<br>
        format: "image/png",<br>
        transparent: true,<br>
        wrapDateLine: true,<br>
        opacity: opacitywms1,<br>
        transitionEffect: 'resize'<br>
    });<br>
<br>
 What's wrong? I have to change the style/server and to create a style in<br>
which parts without data can be transparent ? Or i can do it in the client<br>
part?<br>
<br>
Thanks a lot,<br>
<br>
Pascal.<br>
<br>
<br>
<br>
<br>
<br>
<br>
--<br>
View this message in context: <a href="http://osgeo-org.1560.n6.nabble.com/WMS-layers-overlay-between-them-tp5032734.html" target="_blank">http://osgeo-org.1560.n6.nabble.com/WMS-layers-overlay-between-them-tp5032734.html</a><br>

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</blockquote></div><br><br clear="all"><div><br></div>-- <br>Ian Turton<br>
</div>