Hide tool bar in cognos viewer

1) Take HTML drop in Header

paste the following code

<script language="JavaScript">

var y=getFormWarpRequest().elements["cv.id"];

// RS means it has been launched from Report Studio
// _NS_ means it has been launched from Cognos Connection
if(y.value == "RS") {
window.oCVRS.rvMainWnd.setToolbar(
{
"namespace":"RS",
"divId":"CVToolbarRS",
"style":"toolbar","S":[
{"P":
{"Y":"vertical_line"}
},
{"P":
{"Y":"vertical_line"}
},
{"P":
{"Y":"vertical_line"}
},
{"P":
{"Y":"vertical_line"}
},
{"P":
{"Y":"vertical_line"}
},
{"B":
{"N":"openWith",
"M":
{"id":"openWithwindow.oCVRS",
"Y":"dropDown",
"H":"true",
"IS":[]}
}
}
]
}
);
}else{
window.oCV_NS_.rvMainWnd.setToolbar(
{"namespace":"_NS_",
"divId":"CVToolbar_NS_",
"style":"toolbar",
"S":[
{"P":
{"Y":"vertical_line"}
},
{"P":
{"Y":"vertical_line"}
},
{"P":
{"Y":"vertical_line"}
},
{"P":
{"Y":"vertical_line"}
},
{"P":
{"Y":"vertical_line"}
},
{"B":
{"N":"openWith",
"M":
{"id":"openWithwindow.oCV_NS_",
"Y":"dropDown",
"H":"true",
"IS":[]}
}
}
]
}
);
}

</script>