Finally got the answer! :) Just the script did the trick. Here is how I did it:
<div class="control-group">
<label class="control-label">Payment Mode</label>
<div class="controls">
<select id="payment" class="input-xlarge">
<option value="" class="input-xlarge">Select your Payment mode</option>
<option value="cash">Cash Deposit</option>
<option value="cheque">Cheque Deposit</option>
<option value="online">Online Transaction</option>
<option value="transfer">ATM Transfer</option>
</select>
</div>
<div class="iscash" >
<div class="control-group">
<input class="input-xlarge focused" id="focusedInput" type="text">
</div>
<div class="control-group">
<input class="input-xlarge focused" id="focusedInput" type="text">
</div>
<script>
$('[class^=is]').hide();
$("#payment").change(function() {
var value = $("#payment option:selected").val();
var theDiv = $(".is" + value);
theDiv.slideDown();
theDiv.siblings('[class^=is]').slideUp();
});
</script>
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