#footer { height: 15px; }
#footer span {
	float: left;
	font-weight: bold;
}	

#footer span.dti {
	float: right;
	background: url("http://global.santoagostinho.edu.br/img/logodtirodape.png") no-repeat right center;
	padding-right: 25px;
}

#footer img {
	float: right;
	border: 1px solid red;
}