[Users] Basic WMSCapabilitiesStore question

[Jason Woolard]

hi all,

I saw a few posts in the archives related to this but I'm still unclear 
about how get it working. Using the wms-capabilities I'm able generate a 
grid of wms capabilities using an xml document saved locally:

  store = new GeoExt.data.WMSCapabilitiesStore({
         url: 'WMSServer.xml',
         autoLoad: true
     });

But I really want to retrieve a document from an external server. 
Something like

store = new GeoExt.data.WMSCapabilitiesStore({
         url: 'http://www.someWMSsomewhere......',
         autoLoad: true
     });

A post in the archives points to the same origin policy as the reason 
for this and says a scripting proxy is needed but then I saw something 
else that suggested I might not need one. Is that the issue here?

Thanks in advance..