#header {
background-image: url(gfx/header.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}

#header_geologie {
background-image: url(gfx/header_geologie.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}

#header_mo_krebse {
background-image: url(gfx/header_mo_krebse.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}

#header_mo_ophiuren {
background-image: url(gfx/header_mo_ophiuren.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}

#header_k_fische {
background-image: url(gfx/header_k_fische.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}

#header_om_fische {
background-image: url(gfx/header_om_fische.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}

#header_om_schnecken {
background-image: url(gfx/header_om_schnecken.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}

#header_om_naut {
background-image: url(gfx/header_om_naut.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}

#header_om_muscheln {
background-image: url(gfx/header_om_muscheln.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}

#header_um_amm {
background-image: url(gfx/header_um_amm.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}

#header_om_cer {
background-image: url(gfx/header_om_cer.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}

#header_verein {
background-image: url(gfx/header_verein.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}

#header_om_rep {
background-image: url(gfx/header_om_rep.jpg); 
height: 250px; 
width: 830px; 
border: 1px solid #000000;
}