<head>
<title></title>
<script type="text/javascript">
function sendThis(l){
if(document.getElementById('inputxt').value.length==l)
{document.form.submit();}}
</script>
</head>
<body>
<form name="form" action="sin inputt.htm" method="GET">
<input type="text" maxlength="120" onkeyup="sendThis(120)"
name="input" id="inputxt" />
<input type="submit" />
</form>
</body>
And create on the action target, sin inputt.htm on this case, add this
<head>
<title></title>
<script type="text/javascript">
var u=document.location.href;
function getVar(){
document.getElementById('yourPost').innerHTML=u.substr(u.search(/=/)+1);
}
</script>
</head>
<body onload="getVar()">
PREVIOUS POSTS
<div id="yourPost"></div>
</body>