$('.close').click(function (){
$(this).closest('.success').remove();
});<form action="" id="testForm" method="post">
<label for="test1">Единица: </label><br /><input type="text" id="test1" name="test1" onkeydown="test()" />
<label for="test2">Единица: </label><br /><input type="text" id="test2" name="test2" />
</form>
<script type="text/javascript">
function test() {
var a = document.forms.testForm.elements.test1.value;
document.forms.testForm.elements.test2.value = a;
}
</script>