i need to delete the dynamically created rows in a table by clone method in jquery ,one by one, and i d'nt need to delete the first row. and also need to perform the null check ,but there are...

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HTML

jQuery

<script type="text/javascript" >

$(document).ready(function(){

$("#but").click(function (){

var newRow = $('#tb tbody>tr:last').clone(true).appendTo('table')
.find('input').val('');
return false;

});
$("#delete").click(function(){
if($('#tb tbody>tr:last').closest("tr")==$('#tb tbody>tr:first')){
break;
}
else{
$('#tb tbody>tr:last').remove();
return false;
}
});


});

</script>


And my html file contain

<form name="form1" action="interview.php" method="POST"><button id="but">add</button><button id="delete">delete</button>
<table id="tb" >
<tbody>
<tr><td>name:</td><td><input type="text" name="name[]"></td><td>ACC NO</td><td><input type="text" name="acc_no[]"></td></tr>
</tbody>

</table>
<input type="submit" value="submit">
</form>