function preloadImage()
{
	setRollover("arank_item1","images/top_cbplan1.png","images/top_cbplan2.png");
	setRollover("arank_item2","images/top_moshikomi1.png","images/top_moshikomi2.png");
	setRollover("arank_item3","images/top_toiawase1.png","images/top_toiawase2.png");
}