HI,
The html is all broken on that page which is why you have hundreds of lines at the bottom. The divs haven’t been closed properly and so all appear nested hence the hundreds of lines. Also the images have all the closing tags missing and you also have some closing p tags like this <p/> instead of </p>.
Your html comments are also incorrectly formed and there must be no spaces between the dashes.
This is correct:
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This is Not correct:
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Run the html through the validator and it will pick all these errors up.
Here is the code tidied up and valid.
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<title>Image Gallery - Photos of Bascote Lodge Stud's Traditional Gypsy Cobs</title>
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<h1>Bascotelodgestud.com</h1>
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<p>Bascote Lodge Stud - breeders of Traditional Gypsy Cobs and
home to <em>Kingmaker</em>!</p>
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<li><a href="for sale.html">For Sale</a></li>
<li><a href="gallery.html">Image Gallery</a></li>
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<h2>Image Gallery</h2>
<p>Below are photos of some of our lovely Gypsy Cob mares,
foals and yearlings that we have bred over the years. Our foals
are all sired by Kingmaker except for four foals born 2011
which are sired by Bascote Charles.</p>
<p> Please drop me a line if you are interested in reserving a foal <a href="mailto:sarahmorley@sarahannmorley.myzen.co.uk"> or are looking for a special pony and family friend.</a></p>
<div class="galleryphoto"> <img alt="Horse" src="gallery/King.jpg" width="350" height="400" />
<p> "Kingmaker - Traditional Piebald Gypsy Cob Stallion".</p>
<p>Kingmaker is the perfect Traditional Gypsy Cob!
He has a small, handsome, neat head with small ears
and a broad chest, with a short back and wonderful
rounded rump.
He stands at 14hh and is heavy boned with loads of
silky feather.
He has a wonderful temperament which he passes on to
his progeny.<span class="photocredit"> [Photographer: S. Morley] </span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Billy4.jpg" width="400" height="318" />
<p>"Bascote Dreams Can Come True is a two year old gelding."</p>
<p>He was bred by Bascote Lodge Stud and is full
brother to Bascote Edward and Bascote Catherine.
His dam is Uncle Henry's Mare a superb Vines bred mare
and his sire is Kingmaker.
Billy won a large Youngstock Class at The Devon County Show,
competing against 40 horses on his first outing. He is a
wonderful show horse and will go to the top.<span class="photocredit"> [Photographer: Owner]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Xander.jpg" width="350" height="500" />
<p>"Bascote Alexander at his first show."</p>
<p>Xander is a yearling gelding out of The Eastwood Filly.
He is a wonderful liver chestnut and a stunning horse.
He is already being shown in Youngstock Classes by his
new owner.<span class="photocredit"> [Photographer: Owner]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Victoria.jpg" width="400" height="318" />
<p>"Bascote Victoria in the winter"</p>
<p>This filly is out of Henry's Filly and is a super
heavy-weight star!
She has been sold to the U.S.A.and will mature
at over 15hh. Victoria is full sister to Bascote
Charles and Bascote King John.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Beau and Beauty.jpg" width="400" height="400" />
<p>"Bob's Beau, one of our foundation mares".</p>
<p>Beau is by Bob The Blagdon, out of Peter Ash's
Splash Mare. She stands at 14.1hh and has fantastic
feather and bone.
Beau produces outstanding foals with stunning looks.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Isabella and Paddy2.jpg" width="500" height="400" />
<p>"Bascote Isabella, one of our foundation mares".</p>
<p>Isabella is the daughter of Bob's Beau and her
sire is the grey stallion Blue Billy Boy.
Isabella is a stunning mare with unique colouring.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Filly and Henry.jpg" width="500" height="500" />
<p>"Henry's Filly is our tallest and heaviest foundation mare."</p>
<p>Her sire is Pablo. Filly throws very heavy-boned foals
and is dam of Bascote King John and Bascote Henry.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Bobbi and April2.jpg" width="400" height="500" />
<p>"Bobbi is a foundation mare by Bob the Blagdon."</p>
<p>Bobbi has the most wonderful temperament.
She stands at 14.1hh and her gorgeous 2011 filly foal
April is already SOLD.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Woody2.jpg" width="400" height="500" />
<p>"The Eastwood Filly, a superb piebald mare."</p>
<p>This mare produces stunning foals! Her sire is
Bob the Blagdon and her dam The Eastwood
Mare. Her foals are all heavy and beautifully marked.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Mary and Teddy.jpg" width="500" height="450" />
<p>"Uncle Henrys Mare is Vines bred and it shows!." </p>
<p>This mare produces exquisite show cobs with
stunning markings and long silky feathers and the
most amazing movement.
Mary stands at 14hh and is our oldest foundation mare.
Mary has produced Bascote Harry, Bascote Dreams Can Come True,
Bascote Edward and Bascote Catherine to name a few.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Farmers and Gracie1.jpg" width="480" height="500" />
<p>"The Farmers Mare with her foal Bascote Gracie."</p>
<p>This mare produces petite foals with stunning
markings and small neat heads.
The Farmers mare is one of our smallest mares
and is by The Farmer stallion.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Louis.jpg" width="400" height="500" />
<p>"The Eastwood Mare and her foal Bascote Louis."</p>
<p>This mare is dam to The Eastwood Filly and
is a classical Traditional Gypsy Cob mare. She
stands at 14.1hh and is homozygous for the tobiano
gene.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Patch and Ryan1.jpg" width="500" height="500" />
<p>"Patch and her foal Bascote Ryan."</p>
<p>Patch is a lovely tricolour mare who stands at 13.1hh.
Her colt foal Bascote Ryan is by Bascote Charles
and he already has a huge front just like his sire.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Gem and Charlotte.jpg" width="480" height="500" />
<p>"Gem and her filly foal Bascote Charlotte."</p>
<p>Gem produces bay fillies and bay tobiano
colt foals.
Each foal has beautiful markings and superb
conformation.
Gem stands at 14.0hh and her foals mature
to this height.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/William.jpg" width="500" height="450" />
<p>"Bascote William is out of The Eastwood Mare."</p>
<p>William is a gorgeous gelding standing at 13.2hh.
He has been sold to a family who will break him and
ride him in all disciplines.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Sophia.jpg" width="400" height="550" />
<p>"Bascote Sophia at 12 months old."</p>
<p>Sophia ia a very unusually marked tricolour
filly with striking eye colouration.
She will mature at 14.0hh and has been sold as
a potential leisure horse.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Maggie.jpg" width="400" height="500" />
<p>"Bascote Maggie at 14 months old."</p>
<p>Maggie is a stunning bright bay filly with
amazing movement.
Her dam is Gem and her sire Kingmaker.
Maggie has been sold as a show cob.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/James, 2 years.jpg" width="400" height="500" />
<p>"Bascote James at 2 years old."</p>
<p>James is out of Patch and by Kinmaker.
He is a gorgeous tricolour gelding and will mature
at 15.0hh.
He will be riden as a leisure horse by his
new owners.<span class="photocredit"> [Photographer: Owner]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Honey1.jpg" width="450" height="450" />
<p>"Bascote Honey, a stunning 18 month old piebald filly."</p>
<p>Her sire is Kingmaker and her dam the super
heavyweight Henry's Filly. Honey has been sold
as a broodmare.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Harry5.jpg" width="450" height="450" />
<p>"Bascote Harry is a 14.1hh gelding out of Uncle
Henry's Mare."</p>
<p>Harry is a fantastic gelding with loads of
feather, superb markings and the most laid back,
sweet temperament.He is been lightly broken
and has 3 excellent paces. His new owners plan
to show him under saddle.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Bertie.jpg" width="480" height="400" />
<p>"Bascote Albert is a yearling colt out of Bob's Beau." </p>
<p>Bertie is stunning colt with superb conformation,
excellent temperament and unusual liver chestnut colouring.
He has been sold to a family who will break him for driving.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Matilda.jpg" width="520" height="450" />
<p>"Bascote Matilda at 12 months old."</p>
<p>Matilda is a lovely filly out of Little Patchy
and by Kingmaker. She will mature at 14.0hh
and is destined for the show ring!
Her new owners plan to show her next year.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Henry.jpg" width="450" height="400" />
<p>"Bascote Henry is a 18 month old colt out of Henry's Filly."</p>
<p>Henry is a fantastic colt with superb
markings and will make 15hh.
He is very laid back with a gentle, sweet temperament.
He is has been sold to a suberb home.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
<div class="galleryphoto"> <img alt="Horse" src="gallery/Teddy.jpg" width="450" height="400" />
<p>"Bascote Edward is a 18 month old yearling gelding out of
Uncle Henry's Mare."</p>
<p>Teddy is a fantastic gelding with loads of
feather, superb markings and a lovely nature.
Teddy has been sold to a showing home
and we wish him every success in the ring.<span class="photocredit"> [Photographer: S. Morley]</span></p>
</div>
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I would have actually used a list for all those divs and you wouldn’t have really need a class on every div.
It looks like you should set the images to display:block and stop the text from starting at the edge of the image.
.galleryphoto img{display:block;margin:auto}
You also need to add the correct description to the image alt attribute which you had left off.
Lastly those images are much too big a file size. Each one is about 500k and should be more like 40k at most. Don’t resize the image in the browsers but resize then in your paint package and then optimise them to a reasonable file size.