title: captcha refreshing with refresh button
body: <p>I am developing a website with php, i'm also using javascript in it.</p>
  
  <p>I have to refresh captcha in my website with a refresh button when a captcha is unreadable to a user.</p>
  
  <p>how can i do this.
  please share any idea or codes to me</p>
  
  <p>Thanks</p>