I have been previously using EPSG:4326 and when I declare my map it is like
so - 

 //Create Map
    map = new OpenLayers.Map('map',{controls: [],
    maxExtent: new OpenLayers.Bounds(-20037508.34, -20037508.34,
20037508.34, 20037508.34),
    maxResolution: 156543.0399,
    numZoomLevels: 20,
    units: 'm',
    projection: new OpenLayers.Projection("EPSG:900913"),
    displayProjection: new OpenLayers.Projection("EPSG:4326")
    });

Well our existing mapping application has the correct coordinate system we
use (3TM-114) which I looked up information for and determined that it is
EPSG:3776. Now previously when I have tried to get the measure tool to work
it's obviously the incorrect results as I am projecting in 900913. Is is
possible for me to change my projection now to 3776 and is this supported by
openlayers or must I use another mechanism like Proj4js to accomplish this
so I can get the measure distance/area to similar units as our existing
application? Appreciate any assistance as I am no means familiar with
coordinates systems and projections etc.
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