getElementsByClassName using JavaScript

<script type="text/javascript">

function Readall()

{

var currSelected = document.getElementsByClassName("clsSample″);

for (var i = 0; i < currSelected.length; i++)

{

alert(currSelected[i].value);

}

}

</script>

<div>

<input class="clsSample" id="txt1″ value=" type="text" />

<input class="clsSample" id="txt2″ value=" type="text" />

<input class="clsSample" id="txt3″ value=" type="text" />

</div>