You can copy this code after the </head> tag in your webpage to cloak your affiliate links.

<frameset border=”0″ frameborder=”0″ marginleft=”0″ margintop=”0″ marginright=”0″
marginbottom=”0″ rows=”100%,*”>
<frame src=”YOUR AFFILIATE LINK HERE” scrolling=”auto”
frameborder=”no” border=”0″ noresize>
<frame topmargin=”0″ marginwidth=”0″ scrolling=”no” marginheight=”0″
frameborder=”no” border=”0″ noresize>
<noframes>
<body>
You can add Google Analytics code here.
</body>
</noframes>
</frameset>

You can register a similar looking domain name to that of the product. Example, productreview.com and put this code so that the user thinks he is in the original website!