<style>

</style>  
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>
<script type="text/javascript" src="jquery.colorbox.js"></script>
<script>
$(document).ready(function() {
	$('.button').click(function() {
	var str=$('.text').val();var txt=$('.word').val();
	var a=str.replace("**",txt);
	$('.text').val(a);
});

});

</script>



<div class="form" style="text-align:center;">
	Word:<input type="text" class="word"></input>
	<input type="button" class="button"></input>
	<div>Text:
		<textarea rows="4" cols="50" class="text">
		</textarea>
	</div>