the other links are being striped by the FCKEditor because they are empty
add a non breaking space between the links so they will be retained:
<p><a href="images/Galleries/NatStonePebble/Gallery1/NSP1__MG_2822.jpg" rel="lightbox[NSP1]"><img src="images/S_peb2.jpg" alt="natural stone pebble" width="210" height="100" border="0" /></a>
<a href="images/Galleries/NatStonePebble/Gallery1/NSP1_DPP_0033.jpg" rel="lightbox[NSP1]"> </a>
<a href="images/Galleries/NatStonePebble/Gallery1/NSP1_DPP_0066.jpg" rel="lightbox[NSP1]"> </a>
<a href="images/Galleries/NatStonePebble/Gallery1/NSP1_DPP_0083.jpg" rel="lightbox[NSP1]"> </a>
<a href="images/Galleries/NatStonePebble/Gallery1/NSP1_IMG_4642.jpg" rel="lightbox[NSP1]"> </a>
<a href="images/Galleries/NatStonePebble/Gallery1/NSP1_IMG_4647.jpg" rel="lightbox[NSP1]"> </a>
<a href="images/Galleries/NatStonePebble/Gallery1/NSP1_IMG_6763.jpg" rel="lightbox[NSP1]"> </a></p>