function intro() {
bgc = new Array();
bgc[0] = "#000";
bgc[1] = "#fff";
bgc[2] = "#fff";
bgc[3] = "#fdd";
bgc[4] = "#dfd";
bgc[5] = "#ddf";
bgc[6] = "#ddd";
bgc[7] = "#eef";
bgc[8] = "#efe";
bgc[9] = "#fee";
bgc[10] = "#fef";
bgc[11] = "#eff";
bgc[12] = "#ffe";
var n = Math.floor(Math.random()*bgc.length);
document.getElementById("index").style.backgroundColor=bgc[n];
//new Effect.Appear("tc", { from:0.1, to:1.0, duration: 2 });
}