diff --git a/javascript/convcsv.html b/javascript/convcsv.html
new file mode 100644
index 0000000..5750d0c
--- /dev/null
+++ b/javascript/convcsv.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<!--
+Copyright (c) 2012 kou029w
+Licensed under the MIT License.
+http://kou029w.appspot.com/mit-license.txt
+-->
+<html>
+<head>
+  <title>t-sat|js</title>
+  <meta charset='utf-8'>
+  <script>
+  function convcsv(){
+    t=document.getElementById("csv");
+    w=t.value.split(/\n/);
+    r=[];
+    for( i=0; i<w.length; i++ ){
+      w[i]=w[i].replace(/^([^,]*,){1}(.*)(,[^,]*){11}$/,"$2").replace(/^[a-z,].*/i,"");
+      if(w[i]!=""){
+        w[i]=w[i].replace(/$/,",0.000000").replace(/([0-9]{5},)/g,".$1");
+        r.push(w[i]);
+      }
+    }
+  document.getElementById("result").value=""+r.join("\n");
+  }
+  </script>
+</head>
+<body>
+<form action="">
+  <textarea id="csv" name="" rows="10" cols="30">Time,Lat,Lon,Age,AccX,AccY,AccZ,GyroX,GyroY,GyroZ,MagX,MagY,MagZ,Msg
+30091,,,,11,-23,259,,,,,,,
+30115,,,,,,,-75,63,-9,,,,
+30134,,,,,,,,,,-264,61,781,
+30153,3551628,13417210,3,,,,,,,,,,
+30174,,,,10,-21,260,,,,,,,
+30193,,,,,,,-94,89,-5,,,,
+30213,,,,,,,,,,-268,62,778,
+30231,3551628,13417210,4,,,,,,,,,,
+30258,,,,9,-19,261,,,,,,,
+30277,,,,,,,-139,154,8,,,,
+30296,,,,,,,,,,-272,72,782,
+30315,,,,0,-30,260,,,,,,,
+30333,,,,,,,-103,151,56,,,,
+30353,,,,,,,,,,-290,88,779,
+30371,3551628,13417210,4,,,,,,,,,,
+30403,,,,-27,-61,252,,,,,,,
+30423,,,,,,,13,-74,43,,,,
+30447,,,,,,,,,,-290,88,779,
+30466,3551628,13417210,3,,,,,,,,,,
+30487,,,,3,-31,256,,,,,,,
+30505,,,,,,,-25,-12,-2,,,,
+30525,,,,,,,,,,-279,83,783,
+30543,3551628,13417210,4,,,,,,,,,,</textarea>
+  <input type="button" value="convcsv" onClick="convcsv()">
+  <textarea id="result" name="" rows="10" cols="30"></textarea>
+</form>
+</body>
+</html>
