自动弹出类似灯箱的东西

I need a popup that automatically comes up in the index page of my website. It needs to be close-able by the user and must accept HTML/JavaScript languages inside the popup. Lightbox does this with images but doesn't have the auto popup feature. I have searched around on the net for something to work but I guess I am not entering the correct keywords

NOTE: I am not looking for a JavaScript popup that opens in a completely different window.

I think you might be looking for something like this http://jqueryui.com/demos/dialog/

http://planetozh.com/projects/lightbox-clones/

This is a pretty big list of such boxes. On that site you can filter for what you need ;).

I typically jump straight to fancybox when doing anything like this. Here you'll also find specific details about opening fancybox on page load. Hope this helps!

A demo popup without plugin. You've to modify it as need.

HTML

<div id="popup" class="hide">
  <p><span class="close"> x </span>Language Selection</p>
  <select id="languages">
    <option value="">-- Please Select any language</option>
    <option value="html">HTML</option>
    <option value="js">JavaScript</option>
  </select>
</div>

CSS

.hide {
    display: none;
    width: 300px;
    height: 100px;
    border: 2px solid #ddd;
}
#popup p {
    background: #ccc;
    padding: 5px;
}
.close {
    display: block;
    height: 5px;
    width: 5px;
    float: right;
    padding-right: 5px;
    cursor: pointer
}

jQuery

$(document).ready(function() {
    var selection = null;
    $('#popup').show();
    $('#languages').on('change', function() {
        selection = this.value || null;
    });
    $('.close').on('click', function() {
        if (!selection) {
            alert('Please any one language');
        } else {
            alert('Thanks');
            $('#popup').hide();
        }
    });
});

Just a demo