img = new Array(4); 
img[0] = "<a href=http://www.porn-stars.pl/?ref=lolidka><img src=baners/porn-stars.gif alt='gwiazdy porno' width=200 height=200 border=0></a>";
img[1] = "<a href=http://www.misjadziwka.pl/?ref=lolidka><img src=baners/misjadziwka.gif alt='misja dziwka' width=200 height=200 border=0></a>";
img[2] = "<a href=http://www.eroton.pl/?ref=lolidka><img src=baners/eroton.gif alt='filmy porno' width=200 height=300 border=0></a>";
img[3] = "<a href=http://www.lodyzpolykiem.pl/?ref=lolidka&nw ><img src=baners/lodyzpolykiem.gif alt='lody z połykiem' width=200 height=200 border=0></a>";
index = Math.floor(Math.random() * img.length);
document.write( img[index] );