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<textarea name="content" cols="15" rows="3" class="textarea"> </textarea>
<script type="text/javascript" src="https://54zm.wodemo.com/down/384323/jquery.js"></script>
<script>
$(function(){
$(".addtext").click(function(){
var Text = $(".textarea").val();
$(".textarea").val(Text+"@123");
});
});
</script>