Your selector is wrong
$("div#right_contan#<%=FormView1.ClientID %> div.img_slider_car p.thumbs a")
will be something like
<div id="right_contan"> <!--
<div class="img_slider_car">
<p class="thumbs">
<a></a>
</p>
</div>
</div>
wich is not valid
but, based on you jsfiddle example
the code you need is
$("a[href='http://www.abumousamotors.com/WebStock_Images/noimage.png']").hide()
or
$("a[href$='noimage.png']").hide()
if you need somethig more specific
$("#right_contan .img_slider_car p.thumbs a[href$='noimage.png']").hide()
Hope it helps