[Deff]

<script src="http://code.jquery.com/jquery-latest.js"></script> 
<button onclick="showErr(this)">Ошибка 1</button>
<button onclick="showErr(this)">Ошибка 1, Ошибка 2</button>
<button onclick="showErr(this)">Ошибка 2, Ошибка 3</button>
<div id="cont"></div>
<script>

(function () {
 var Isx='<span>&. </span>',TimerId_00,OBJ={};
  return showErr = function (a) {
	errors=$(a).html().split(/,\s*/i);
	for (var i in errors) {OBJ[errors[i]]=Isx.replace('&',errors[i]);}
	clearTimeout(TimerId_00);TimerId_00=setTimeout(function(){OBJ={};$("#cont").html('')}, 5000);
	$("#cont").html('');
	for (var key in OBJ) {$("#cont").append(OBJ[key]);}
  }
}())
</script>

<script src="http://code.jquery.com/jquery-latest.js"></script>
<div id="but-wrp">
	<button>Ошибка 1</button>
	<button>Ошибка 1, Ошибка 2</button>
	<button>Ошибка 2, Ошибка 3</button>
</div>
<div id="cont"></div>

<script>
 (function () {
  var Isx='<span>&. </span>',TimerId_00,OBJ={};
  $("#but-wrp button").click(function () {
	errors=$(this).html().split(/,\s*/i);
	for (var i in errors) {OBJ[errors[i]]=Isx.replace('&',errors[i]);}
	clearTimeout(TimerId_00);TimerId_00=setTimeout(function(){OBJ={};$("#cont").html('')}, 5000);
	$("#cont").html('');
	for (var key in OBJ) {$("#cont").append(OBJ[key]);}
  });
}())
</script>