body, div {margin: 0; padding: 0; text-allign: center }

#nav {float: left; width: 100px}
#ads {float: right; width: 100px}

#txt {margin-left: 105px; margin-right: 105px}

#ftr {clear: both}

#hdr  {background-color: #000000;
	height: 200px;
	width: 100%;}
#nav, #ads {background: yellow}
#txt       {backgorund: lime}
#ftr  {background-color: #000000;
	height: 50px;
	width: 100%;}

#hdr img {width: 250px; height: 25px }
#ads img {width: 75px; height: 100px }
#txt img {width: 150px; height 200px }