http://realmind.tistory.com/entry/Javascript-Escape-Encoder-v01
<html>
<head>
<script>
function encode(){
var original = document.forms[0].original.value;
var encoded = encodeURI(original);
document.forms[0].encoded.value = encoded;
}
</script>
</head>
<body>
<form name="form">
<input type="text" name="original" width="100%"/><br/>
<input type="text" name="encoded" width="100%"/><br/>
<a href="javascript:encode()">encode</a>
</form>
</body>
</html>