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Passing PHP variable to Javascript function

<?php $repname    = $_SESSION['REPNAME']; ?>

<script type="text/javascript" src="js/chat.js"></script>

 

<input type="button" name="btn_send_chat" id="btn_send_chat" value="Send" onclick="javascript:sendChatText('<?php echo $repname;?>');" />

       

function sendChatText(repname) {

    alert(repname);

 

        }

       

var repName;

        function sendChatText() {

        repName = '<?php echo $repname;?>';

                    }