fertig = false;
//alert(fertig);

abt_on = new Image();
abt_on.src = "img/nav/n_abt01.gif"
abt_of = new Image();
abt_of.src = "img/nav/n_abt00.gif"

ref_on = new Image();
ref_on.src = "img/nav/n_ref01.gif"
ref_of = new Image();
ref_of.src = "img/nav/n_ref00.gif"

prt_on = new Image();
prt_on.src = "img/nav/n_prt01.gif"
prt_of = new Image();
prt_of.src = "img/nav/n_prt00.gif"

dwn_on = new Image();
dwn_on.src = "img/nav/n_dwn01.gif"
dwn_of = new Image();
dwn_of.src = "img/nav/n_dwn00.gif"

cnt_on = new Image();
cnt_on.src = "img/nav/n_cnt01.gif"
cnt_of = new Image();
cnt_of.src = "img/nav/n_cnt00.gif"

function bw(bild,aktion) {
         if (document.images && fertig) document.images[bild].src = aktion.src;
}