when you add a "add to cart" button, you have to avoid "a href" link because Google are going to use it (with all link) to analyse popularity of website a good button must be :
ex : Amazon:
<input type="image" border="0" src="/ http://g-ecx.images-amazon.com/images/G/08/x-locale/common/transparent-pixel. V192553961.gif"
name="submit.add-to-cart" value="" id="bb_atc_button" class="dpSprite
s_bbAdd2Cart " alt="add to cart" title=""/>
s_bbAdd2Cart " alt="Ajouter au panier" title=""/>
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when you add a "add to cart" button, you have to avoid "a href" link because Google are going to use it (with all link) to analyse popularity of website a good button must be :
ex : Amazon:
<input type="image" border="0" src="/ http://g-ecx.images-amazon.com/images/G/08/x-locale/common/transparent-pixel. V192553961.gif"
name="submit.add-to-cart" value="" id="bb_atc_button" class="dpSprite
s_bbAdd2Cart " alt="add to cart" title=""/>
s_bbAdd2Cart " alt="Ajouter au panier" title=""/>