Check username availability via AJAX with jQuery

HTML <input name="UserName" id="UserNameInputID" type="text" /> <span id="loading"><img src="loading.gif" alt="i" /> Checking...</span> JavaScript $("#loading").hide(); var orig=$("#loading").html(); $("#UserNameInputID").blur(function() { $("#loading").html(orig); $("#loading").show(); loadTextPage("loading","check.php?username="+$("#UserNameInputID").val()); }); /** load a text page into this div */ function loadTextPage($pDivID,$pURL) { $.ajax({ url:$pURL, dataType:'html', success:function (txt) { $('#'+$pDivID).html(txt); } }); Server-side check.php <?php if ($vAvailable) { echo 'Congrats! Your username is available'; } else { echo 'Sorry! Your username is not available'; } ?>