puede ser algo asi
Código HTML:
<html><head>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('.brc').click( function(e){
var index = $(this).index();
$('#buscar>div').each( function (i, val){
$(val).find('div:eq('+index+')').css('color', 'red').siblings().css('color', 'blue')
});
});
});
</script>
</head>
<body>
<div id="buscar">
<div id="cont1">
<div class="brc">1</div>
<div class="brc">2</div>
<div class="brc">3</div>
<div class="brc">4</div>
</div>
<div id="cont2">
<div class="brc">1</div>
<div class="brc">2</div>
<div class="brc">3</div>
<div class="brc">4</div>
</div>
</div>
</body>
</html>