Look for this lines

    .f1.mb.m1 add radiobutton -label "Mesh Interplation"       -variable demo -command { load_script meshanim.tcl    0.5 

/usr/camera.tz 100 
}

thereafter paste this:



    .f1.mb.m1 add radiobutton -label "MD2 Interplation"       -variable demo -command { load_script md2anim.tcl    0.5 
/usr/lookat.txyz   0 10 0
}
