sağ bölümü nasıl kaybedebilirim ?

<style type="text/css">
            <!--
td.nav {visibility:hidden;}
--> </style> 

<style type="text/css">
td.edit_rb_footer{visibility:hidden;}
td.sidebar_heading{background-image: url();}
td.shouty{visibility:hidden;}
td.shouty2{visibility:hidden;}
td.shouty3{visibility:hidden;}
td.shouty4{visibility:hidden;}
td.shouty5{visibility:hidden;}
</style>