and suddenly the error because

Today, all new built with Joomla 3.0 and 3.0 Hotgaming zone, please scroll down. The error is only at home. You have there a solution? www.36mm.ch , Sincerely, Fredy

Open:

components/com_k2/css/k2.css

find:

span.catItemImage img {
border: 1px solid #ccc;
padding: 8px;
}

add this property:

max-width: 100%;

so it's :

span.catItemImage img {
border: 1px solid #ccc;
padding: 8px;
max-width: 100%;
}