CSS: мозаичные коробки, которые имеют неправильную высоту

Question

Я хочу, чтобы ящики были похожи на эту картинку ниже,

, у которых все коробки имеют одинаковую ширину и высоту, примите одну из них, мне нужно изменить ее высоту до 500px для определенных случаев. Но я не могу сделать это правильно!

http://rokhsanafiaz.co.uk/dump/1.php

вот мой css,

* { 
    margin: 0; 
    padding: 0; 
    }

h1,h2,h3,h4,h5,h6,pre,code,address,caption,cite,code,th { 
    font-size: 1em; 
    font-weight: normal; 
    font-style: normal;
    }

ul,ol,li { 
    list-style: none; 
    margin:0px; 
    padding:0px;
    }

fieldset,img { 
    border: none;
    padding:0px;
    margin:0px;
    float:left; /** a must so that there is no extra gap at the bottom of each image **/
    }

div {
    clear:both;
    border:1px solid #0066FF;
    overflow:hidden;
    }

#main {
    width:785px;
    /**height:837px;  a must for IE, to be handled in jquery **/
    position:relative !important; /** essential for sticking #company at bottom **/
    border:1px solid #000;
    }

#main div {
    clear:none;
    }

.item-global {
    width:335px;
    height:146px;
    background:#ffffff;
    padding:15px;
    position:relative;
    float:left;
    margin: 0px 15px 15px 0px;
    }

.item-global h3 {
    border:0px solid #000;
    margin:0px 0px 5px 0px;
    }

.item-global h3  a{
    font-size:20px;
    color:#0099cc;
    }

.item-global p{
    margin:0px;
    padding:0px;
    font-size:14px;
    line-height:18px;
    clear:both;
    }

.item-global-current {
    height:400px;
    }

и мои наценки,

<!-- item-global -->
    <div class="item-global round-corner">

        <h3><a href="#">Topic 1</a></h3>

        <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy</p>

        <a href="#" class="button-plus"><span>more</span></a>

    </div>
    <!-- item-global -->

    <!-- item-global -->
    <div class="item-global round-corner item-global-current" style="float:none; clear:none;">

        <h3><a href="#">Topic 2</a></h3>

        <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy</p>


        <a href="#" class="button-top-minus"><span>less</span></a>
        <a href="#" class="button-bottom-minus"><span>less</span></a>

    </div>
    <!-- item-global -->


    <!-- item-global -->
    <div class="item-global round-corner">

        <h3><a href="#">Topic 3</a></h3>

        <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy</p>

        <a href="#" class="button-plus"><span>more</span></a>

    </div>
    <!-- item-global -->

    <!-- item-global -->
    <div class="item-global round-corner">

        <h3><a href="#">Topic 4</a></h3>

        <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy</p>

        <a href="#" class="button-plus"><span>more</span></a>

    </div>
    <!-- item-global -->


    <!-- item-global -->
    <div class="item-global round-corner">

        <h3><a href="#">Topic 5</a></h3>

        <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy</p>

        <a href="#" class="button-plus"><span>more</span></a>

    </div>
    <!-- item-global -->

    <!-- item-global -->
    <div class="item-global round-corner">

        <h3><a href="#">Topic 6</a></h3>

        <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy Lorem Ipsum has been the industry's standard dummy</p>

        <a href="#" class="button-plus"><span>more</span></a>

    </div>
    <!-- item-global -->

было бы замечательно, если бы вы знали приемы! спасибо!

Answer 1

Я думаю, вам будет проще объявить два контейнера столбцов отдельно и не смешивать все 7 элементов вместе. Пример .
По крайней мере, это принцип, который я обычно использую: контейнер можно разбить на подконтейнеры по горизонтали или вертикали, но не в обоих направлениях вместе.

<div class="column">
    <div class="normal">1</div>
    <div class="normal">3</div>
    <div class="normal">4</div>
</div>
<div class="column">
    <div class="large">2</div>
    <div class="normal">5</div>    
</div>

Answer 2

Как насчет добавления:

.item-global-current + div { margin-top:-195px; }

Работает в Firefox 3.6.8.