les dejo la dire para que lo vean como anda.. http://www.nicolasroma.com.ar/HTML/A0001.html
Código:
  
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<style>
.gral { width:540px; background-color:#00CC33; margin:auto; padding:5px; overflow:auto;}
.box  { height:80px; width:80px; background-color:#66FF33; margin:5px; float:left; }
</style>
</head>
<body>
<div class='gral'>
	<div class="box">
	</div>
	<div class="box">
	</div>
	<div class="box">
	</div>
	<div class="box">
	</div>
	<div class="box">
	</div>
	<div class="box">
	</div>
	<div class="box">
	</div>
	<div class="box">
	</div>
	<div class="box">
	</div>
	<div class="box">
	</div>
	<div class="box">
	</div>
	<div class="box">
	</div>
</div>
<script type="text/javascript">
var box = document.getElementsByTagName('div');
function agrandar(){ this.style.width = '100px'; this.style.height = '100px'; }
function achicar(){ this.style.width = '80px'; this.style.height = '80px'; }
for (i=1;i<box.length;i++)
{
	box[i].onmouseover = agrandar;
	box[i].onmouseout = achicar;
}
</script>
</body>
</html>
 
 
 De contenedores y posiciones
 De contenedores y posiciones 
 jaja.
 jaja.

