[rudoy24]

Есть код страницы:

...
<div class="class-title">TITLE-1</div>
<img class="class-image" src="http://catalog-img/image-1.jpg" />
...
<div class="class-title">TITLE-2</div>
<img class="class-image" src="http://catalog-img/image-2.jpg" />
...
<div class="class-title">TITLE-3</div>
<img class="class-image" src="http://catalog-img/image-3.jpg" />
...

При помощи следующего скрипта:

var elems = document.querySelectorAll('.class-title, .class-image'),
    massive = document.getElementById('massive');

[].forEach.call(elems, function(self) {
if (self.tagName == 'IMG') {
	massive.value += '<p><img src=\"' + self[self.tagName == 'IMG' ? 'src' : 'innerHTML'] + '\" /></p>\n';
	} else {
	massive.value += '<p>' + self.innerHTML + '</p>\n';
	}
});

ПОЛУЧЕМ:

...
<p>TITLE-1</p>
<p><img src="http://catalog-img/image-1.jpg" /></p>
<p>TITLE-2</p>
<p><img src="http://catalog-img/image-2.jpg" /></p>
<p>TITLE-3</p>
<p><img src="http://catalog-img/image-3.jpg" /></p>
<p>TITLE-1</p>
<p><img src="http://catalog-img/image-1.jpg" /></p>
<p>TITLE-2</p>
<p><img src="http://catalog-img/image-2.jpg" /></p>
<p>TITLE-3</p>
<p><img src="http://catalog-img/image-3.jpg" /></p>
...

Как избавится от дублей, что бы получить?:

...
<p>TITLE-1</p>
<p><img src="http://catalog-img/image-1.jpg" /></p>
<p>TITLE-2</p>
<p><img src="http://catalog-img/image-2.jpg" /></p>
<p>TITLE-3</p>
<p><img src="http://catalog-img/image-3.jpg" /></p>
...