*I don't use jQuery. Can this be solved without it ?*

I have only 1 HTML / JavaScript / (CSS) page. It contains links that reference html elements on the very same page. The page has a automatic vertical scrollbar because it is long. I need my event handler for link clicks **to check if the referenced element is on the screen** at the moment of the click. If it is there the page should not change position. Is that possible and how ?

1. check if on screen
2. don't move page

This code is a simple example that the page jumps so that the "hello world 2" is on the very top of the browser window.

```
<html>
    <head>
        <script type='text/javascript' language='javascript'>
            function onLinkClick(id)
            { }
        </script>
    </head>
    <body>
        <div id="id1">hello world 1</div>
            <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
        <div id="id2">hello world 2</div>
        <a href="#id2" onclick="onLinkClick('id2')">link</a>
        <div id="id3">hello world 3</div>
            <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
    </body>
</html>

```