var ar = new Array("<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100% background=html/cbheader1.jpg WIDTH=661 HEIGHT=140 ALIGN=BOTTOM BORDER=0><TR><TD WIDTH=100%></TD></TR></TABLE>",
  
"<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%  background=html/cbheader1.jpg WIDTH=661 HEIGHT=140 ALIGN=BOTTOM BORDER=0><TR><TD WIDTH=100%></TD></TR></TABLE>",

"<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%  background=html/cbheader2.jpg WIDTH=661 HEIGHT=140 ALIGN=BOTTOM BORDER=0><TR><TD WIDTH=100%></TD></TR></TABLE>",

"<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%  background=html/cbheader3.jpg WIDTH=661 HEIGHT=140 ALIGN=BOTTOM BORDER=0><TR><TD WIDTH=100%></TD></TR></TABLE>",

"<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%  background=html/cbheader4.jpg WIDTH=661 HEIGHT=140 ALIGN=BOTTOM BORDER=0><TR><TD WIDTH=100%></TD></TR></TABLE>");

var num = Math.floor(Math.random() * ar.length);
document.write(ar[num]);