javascript - How can I get the value from a series of textbox with same id -


i have series of textboxes same name

<%for(i=0;i<=nooftasks;i++){%> <input type="text" id="duration" name="duration" class="td4" onkeyup="durationformat()"> }%>

in javascript have add colon after 2 digits 

function durationformat() {     var duration = document.getelementsbyname("duration").value;     if(duration.length==2){         duration=duration+":";     } }

but not desired result not string textbox of particular text box.

any ideas?

 <input type="text" id="duration" name="duration" class="td4" onkeyup="durationformat(this)"> <script>  function durationformat(obj) {      if ((obj.value.length)== 2) {          obj.value+=":";      }   } </script>

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