[OpenLayers-Users] can i put the opacity?

[dario gasparro]

hi staff,

 how can i do for set the opacity at a popup loaded by OpenLayers.Layer.GeoRSS?
 or i can set only the size of the popup troghut it?

 var blue  = new OpenLayers.Icon("marker-blue.png", new OpenLayers.Size(20,25));
 new OpenLayers.Layer.GeoRSS( 'GeoRSS', 'georss1.xml' ,
 {'popupSize':size1,'icon':blue}

 thanks!

ps:
why nobody answer me?is it not an ordinary question?