This script disable the right mouse button on your page and show message to visitor.
Script inserts after <body> tag and works with Internet Explorer 4.x and higher.
<script language="JavaScript1.2">
if (document.all) document.body.onmousedown=new Function("if (event.button==2||event.button==3)alert('Press Reset to continue.')")
</script>
You can change the red marked text to your own.