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On this page: 

Redirect after 5 seconds

<HTML>
<HEAD>
  <TITLE>Redireccionado</TITLE> 
  <SCRIPT LANGUAGE="JavaScript">
  function redireccionar() {
    setTimeout("location.href='articulo.php?id=tw_redireccion'", 5000);
  }
  </SCRIPT>
</HEAD>
<BODY onLoad="redireccionar()">
<P>Bla, bla, bla,...
</BODY>
</HTML>

Validate a email

function validEmail(email) {
  var emailReg = "^[a-z0-9\._-]+@+[a-z0-9\._-]+\.+[a-z]{2,4}$";
  var regex = new RegExp(emailReg);
  return regex.test(email);
}

Creating nodes with Javascript DOM

    var newa=document.createElement('a');
    newa.className="class";
    var newimg=document.createElement('img');
    newimg.src="./image.png";
    newimg.alt="Image name";
    newimg.className="Image class";
    newa.appendChild(newimg);
    newa.href="#";

Validate a url

function validarURL(valor){
  if (/^w+([.-]?w+)*.w+([.-]?w+)*(.w{2,3})+$/.test(valor)){
   return (true)
  } else {
    return (false);
  }
}

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