如何使我的简单警报窗口工作

i'm currentrly coding in php and when i click a button the message should me Would you like to delete this entry?

This is where I'm currently at

<button onClick="alert('Sure to delete entry?')"><a href="delete.php?delete=<?php echo $row['guestbook_id'];?>">Remove Entry</a></button>

And sure it works. But when I press "x" to close the alert window it still deletes the entry. How can you make a popup window that has the "Cancel" opition?

I would really appreciate the help! :)

if (confirm("Your question")) { 
 // do things if OK
}

Use confirm

Click here for examples

The HTML

<a href="delete.php?delete=<?php echo $row['guestbook_id'];?>" 
    onclick="return areYouSure()">Remove Entry</a>

And the JS

function areYouSure()
{
   var con = window.confirm("Are You Sure?");
   if(con)
   {
     return true;
   }
   else
   {
     return false;
   }
}

You can do this using the following JavaScript code:

if (confirm('Sure to delete entry?') == true) {
   //write your code here to delete
}