[OpenLayers-Users] Re: using two Projections?

[BMcBride]

OpenLayers defaults to EPSG:4326, so if you leave the projection empty in the
map options, your map will be EPSG:4326.  You cannot overlay a topo layer
that is in EPSG:4326 onto OSM, which is EPSG:900913.  If your topo layer is
a WMS, it may also be available in EPSG:900913. If it is a vector layer, you
could transform from 4326 -> 900913. 

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Bryan McBride, GISP
OpenGeo - http://opengeo.org 
Expert service straight from the developers. 
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