Need to replace JS alert with jquery popup.

Need to replace JS alert with jquery popup.

Hi Im new to jquery and Im a bit lost, Ive been trying to replace a standard javascript alert with a jquery popup but nothing seems to work, 


Here is all the info for the popup:
  <!-- jQuery -->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.js"></script>

<!-- JNotify -->
<link rel="stylesheet" type="text/css" href="jNotify.jquery.css" media="screen" />
<script type="text/javascript" src="jNotify.jquery.js"></script>

<!-- JS to add -->
<script type="text/javascript">
  $(document).ready(function(){
    $("a.jnotify_exemple").click(function(e){
 e.preventDefault();
 jNotify(
'Here the message !!<br />You can write HTML code <strong>bold</strong>, <i>italic</i>, <u>underline</u>',
{
 autoHide : true, // added in v2.0
 clickOverlay : false, // added in v2.0
 MinWidth : 250,
 TimeShown : 3000,
 ShowTimeEffect : 200,
 HideTimeEffect : 200,
 LongTrip :20,
 HorizontalPosition : 'center',
 VerticalPosition : 'top',
 ShowOverlay : true,
     ColorOverlay : '#000',
 OpacityOverlay : 0.3,
 onClosed : function(){ // added in v2.0
  
 },
 onCompleted : function(){ // added in v2.0
  
 }
});
 });
    });
</script>

<a href="#" class="jnotify_exemple"> Complex Notify </a>
 
I need to replace the alert below:

  function regformhash(form, uid, email, password, conf) {

    // Check each field has a value
    if (uid.value == '' || email.value == '' || password.value == '' || conf.value == '') {
        alert('You must provide all the requested details. Please try again');
        return false;
    }
 
Help anyone?