Es como cuando se hace con una foto (esto es sólo un ejemplo):
Cita: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
#grande {width: 200px;
border: 1px solid #f00;
text-align: justify;
}
#caja {float: right;
height: 80px;
width: 80px;
background-color: #00f;
margin: 10px;
}
.corte {clear: both;}
</style>
</head>
<body>
<div id="grande">
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lasdas das dasd asd asd asd as das dsa as das das asd
asdasd asdsadas dsadasdasdasdasdasds asd as asd as
asd asdasd asda sdasd asdas dasdas dasdasda sda sdsadas
asdsa dsad asdas dasda sdasd as dasdas dasd asds adasda sd <div id="caja"></div>
asda sdasd asd sdas dasda sd asda sdasdas dasdas dasas davsdas das dasdas dasas da
<div class="corte"></div>
</div>
</body>
</html>