<form> 
<input type="text" name="keyword"> 
<input type="button" OnClick="yazdir()" value="Add">  
<input type=hidden name="link"> 
</form>
<span id="deneme"></span>
<script language="JavaScript">
function yazdir () {
var yazI = document.getElementById('keyword').value
document.getElementById('deneme').innerHTML = '<a href="http://deneme-' + yazI + '">açıklamanız ' + yazI + '</a>';
}
</script>