cssAray = new Array();
cssAray[0] = 'http://gaiko.chu.jp/bg0.css'
cssAray[1] = 'http://gaiko.chu.jp/bg0.css'
var dice = Math.floor(Math.random() * 97) + 1;

if (dice <= 96){
	var css = cssAray[0];
}else{
	var css = cssAray[1];
}
document.getElementById("css").href = css;