How To Create New Textboxes?

Script For Create New Textboxes At Runtime.....

<script type="text/javascript">
function NewTextbox()
{
var t = 1;
newTextbox.innerHTML = newTextbox.innerHTML +"<input type=text name='txt'+ t/>"
}
</script>



<form name="form" action="post" method="">
<input type="button" value="Create New TextBox(Click Here)" onClick="NewTextbox()">
<div id="newTextbox"></div>
</form>