calling setInterval() on onclick event

Hi all,

I am trying to call setInterval() on onclick event. But it is executing the code only once. Following is my code.

<script type="text/javascript" language="javascript">
            var xmlHttp;
            function postRequest() {        
                    if (typeof XMLHttpRequest != "undefined"){

                            xmlHttp= new XMLHttpRequest();
                        }else if (window.ActiveXObject){

                            xmlHttp= new ActiveXObject("Microsoft.XMLHTTP");
                         }
                        if (xmlHttp==null){
                            alert ("Browser does not support XMLHTTP Request")
                            return
                        }
                        var url="/AutoDialer/two.jsp";
                        xmlHttp.onreadystatechange = stateChange;
                        xmlHttp.open("GET", url, true);
                        xmlHttp.send(null);      
            }
             function stateChange(){
                        if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
                            document.getElementById("display").innerHTML=xmlHttp.responseText;
                        }
             }
             function send(){       
            // alert("send");       
                var a=setInterval(postRequest(),3000);
                //alert(a+"=: "+a);                             
             }

        </script>

<body>
  <div id="one" onClick="send();"><a href=""><span class="hyper">On Call Report</span></a></div>

</body>
</html>

Here this code is executing two.jsp only once. And ready state is always 1. Please help me in resolving this problem.

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calling setInterval() on onclick event

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