here is a big problem with me in html

Code:
<body>
<pre>	I am here for
					 Three days, SO you can 
			come to me</pre>
		<form name="rate" method="post" target="display.html">
		<input type="radio" name="group" value="worst">

		<input type="button" value="check" 

onclick="javascript:window.location.href=top.html">
		</form>
</body>
I was just practicing with html, when i run this code in IE, and click the button appear, there
was a great flaw, that clicking on this button IE shows my windows folder contents, where this file was stored, what is the reason