[Users] Change Opacity of a layer in a group layer

[julia paredes]

Hi all,
If I have a group layer definition such as the following :
var Test = new OpenLayers.Layer.WMS(                 "Group Layer", mapserverUrl,                {                    map: "C:/Users/Administrator/map.map",                    layers: [                        "First",                        "Second",                        "Third"                     ],                    format: "image/png",                    transparent: "true"                }                ,                {                       isBaseLayer: false,                    visibility: false,                    opacity: opa                }                );
Is there a way I could change the opacity of just one of the layers belonging to the group layer?Before adding a group layer I was using jquery to add a slider and a drop down menu to select a layer to change the opacity.I am not sure if the layer opacity slider provided by GeoExt will make this easier or if there is a way to access a particular layer in the group layer by doing something like Test.layers[0]
Any ideas?
Thanks in advance  		 	   		  
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