HTML Code

<?php  $id=1;?>
<a href="" onClick="popitup('popup1.php?id=<?php echo $id;?>')">Open</a>

Javascript Code

<script type="text/javascript">
function popitup(url) {
newwindow=window.open(url,'name','height=200,width=150');
if (window.focus) {newwindow.focus()}
return false;
}
</script>

For a popup javascript is required. Put this in your header:

Copy<script>
function myFunction()
{
alert("I am an alert box!"); // this is the message in ""
}
</script>

And this in your body:

Copy<input type="button" onclick="myFunction()" value="Show alert box">

When the button is pressed a box pops up with the message set in the header.

This can be put in any html or php file without the php tags.

-----EDIT-----

To display it using php try this:

Copy<?php echo '<script>myfunction()</script>'; ?>

It may not be 100% correct but the principle is the same.

To display different messages you can either create lots of functions or you can pass a variable in to the function when you call it.

You can do it by JavaScript see the solution given below:

Add this script on top of the page in head section

<script>
function pop_up(url){
window.open(url,'win2','status=no,toolbar=no,scrollbars=yes,titlebar=no,menubar=no,resizable=yes,width=1076,height=768,directories=no,location=no') 
}
</script>

Replace these line on your code

<td>
    <a href="update_users.php?person_id=<?php echo $row['person_id']; ?>" onclick="pop_up(this);">EDIT</a>
</td>
<td>
    <a href="delete_users.php?person_id=<?php echo $row['person_id']; ?>" onclick="pop_up(this);">DELETE</a>
</td>

Hope it will help.

Try to close the popup from the new tab on load and not from the popup:

window.opener.close();

Your problem is the quotes, however you don't need to echo it at all. If you need to echo variables inside the url, try this:

<a href="http://www.quackit.com/common/link_builder.cfm?<?php echo $variable;?>" onclick="basicPopup(this.href);return false">Open a popup window</a>

alternatively, you can escape the quotes inside the string using a backslash:

echo "<a href=\"http://www.quackit.com/common/link_builder.cfm\" onclick=\"basicPopup(this.href);return false\">Open a popup window</a>";

Don't echo HTML. Just let PHP output it directly.

<a href="delete_donor.php?id=<?php echo $row->id; ?>" class="delete_icon2" title="Delete Donor"
    onclick="return confirm('Are you sure you want to delete this entry?')"></a></td>

Anything not inside <?php ?> tags is echoed directly to stdout.

php is a server side scripting language. You can do it with jquery. here a demo jsfiddle shows modal popup. Please go through it.

<!-- Button trigger modal -->
<button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
  Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
        <h4 class="modal-title" id="myModalLabel">Modal title</h4>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>