function choices(){

 this[0] = 3;
 this[1] = "<a href=\"http://www.digicake.com.tw/Typer.asp?Typer_ID=46\" target=\"new\"><img alt=\"\" border=\"0\" src=\"http://www.digicake.com.tw/168ad/chocolate_1.jpg\"></a>"
 this[2] = "<a href=\"http://www.digicake.com.tw/Typer.asp?Typer_ID=86\" target=\"new\"><img alt=\"\" border=\"0\" src=\"http://www.digicake.com.tw/168ad/chocolate_2.jpg\"></a>"
 this[3] = "<a href=\"http://www.digicake.com.tw/product.asp?Typer_ID=99&Product_ID=1550\" target=\"new\"><img alt=\"\" border=\"0\" src=\"http://www.digicake.com.tw/168ad/chocolate_3.jpg\"></a>"
 
}
 function grabBanner(){ 
 var choiceInstance = new choices();
 var Banner = choiceInstance[Math.floor(Math.random() * choiceInstance[0]) + 1];
 return Banner;
}
document.writeln(grabBanner());