#centro1
{
	background:  url(../img/pag/gruposycolegios.gif) no-repeat left top;
}

#centro2
{
	background: url(../img/pag/grupos_colegios_ti.gif) no-repeat right top;
}

#presentacion
{
	float: left;
	margin: -92px 0px 0px 38px;
	padding: 5px 45px 5px 10px;
	width: 230px;
	height: 120px;
	background-color: #c90;
}

#principal
{
	float: left;
	margin: -137px 50px 20px 73.5px;
	padding: 150px 10px 5px 10px;
	width: 358px;
	border: 1px dashed #c90;
	border-bottom: 0px;
}

* html div#presentacion
{
	margin: -95px 0px 0px 18px;
	padding: 5px 45px 5px 10px;
	width: 285px;
	height: 110px;
}

* html div#principal
{
	margin: -117px 50px 20px 38px;
	padding: 133px 10px 5px 10px;
	width: 378px;
}

*:first-child+html div#presentacion
{
	margin-top: -73px;
	height: 170px;
}

*:first-child+html div#submenu
{
	height:128px;
	padding: 0;
	margin: 0;
}

*:first-child+html div#principal
{  
	margin-top: -121px;
	margin-left: 74px;
	padding-top: 135px;
}