Copy to the clipboard in JavaScript, securely and without Flash

jscopy.css

a{	cursor:pointer; }
a, a:link {
	background-color: #eee; /*#407EC9*/
	border-radius:5px;
	padding:0px 2px 0px 2px;
	color: #666;
	font-weight: none;
	text-decoration: none;
	opacity:.7;
}

jscopy.html

<!--// www.lsauer.com lo sauer 2011-2012
//description: various unobtrusive text copy-and-paste methods, which do not require an Adobe-flash plugin
//post: 
//see it in action: http://metgate.org/chrome-session-restore/
//note 'return false' prevents further 'bubbling' of the event, and thus inadvertent window-scrolling.
-->
<a class="mylink" href="#" onclick="window.prompt('Press CTRL+C, then ENTER',this.innerText); return false;">%HOMEPATH%\AppData\Local\Google\Chrome\User Data\</a>
Copy and paste the path into the file-dialog below, to quickly navigate to a specific file.
<br>
<input type="file">
<!--
Extended to OS-specific behavior with is.lib:
<a href="#" onclick="if(is.Linux) this.innerText='~/.config/google-chrome/Default'; 
 window.prompt('Press CTRL+C, then ENTER',this.innerText); return false;"
>%HOMEPATH%\AppData\Local\Google\Chrome\User Data\</a>
-->
<!--Alternative 1: preselected textbox-->
<b>Alternative #1 (preselected textbox):</b><br />
<a class="mylink" onclick="this.style.display = 'none'; 
  this.nextElementSibling.style.display = 'inline-block'; 
  this.nextElementSibling.innerText = this.innerText;
  this.nextElementSibling.select();"
>c:\Windows\System32\restore\MachineGuid.txt</a><textarea style="display:none; min-width:33%;" height="1"></textarea>
<br />
<!--Alternative 2: direct textbox-->
<b>Alternative #2 (direct textbox):</b><br />
<textarea title="Click and press CTRL+C to copy..." onclick="this.style.borderColor = 'orange'; 
  this.select();" style="min-width:33%;" height="1"
>c:\Windows\System32\restore\MachineGuid.txt</textarea>

this isn't copying programmatically... you should really change the wording of your description