[Zaja]

Unfortunately the logo dimension is defined in the main.css, search for following lines and change the width and the height values:

#header .line1 {
    position: relative;
    height: 67px;/*  top row */
  direction: ltr;
}
#header .line1 .logo {
  padding-top: 9px;
    margin-left: 27px;
    width: 203px; /* logo container div */
}
#header .line1 .logo a img {
    width: 203px; /* logo width  */
    height: 48px; /* logo height */
}