/* ==================== TOP用メイン画像ランダム表示 ==================== */
var rd = Math.random();
var img1;

if( rd <= 0.25 ){
	img1 = "topimg01";
}
else if( rd <= 0.50 ){
	img1 = "topimg02";
}
else if( rd <= 0.75 ){
	img1 = "topimg03";
}
else if( rd <= 1 ){
	img1 = "topimg04";
}

function mainimg1(){
	document.write('<img src="images/' + img1 + '.jpg" width="555" height="325" alt="" class="img1" border="0" />');
}