function RollOver (obj,val) {
  obj.src = val;
}


img = new Array
("http://www.jbeach.jp/hamada/image/top_pic_01.jpg","http://www.jbeach.jp/hamada/image/top_pic_02.jpg","http://www.jbeach.jp/hamada/image/top_pic_03.jpg")
var gasu = img.length;		// 画像数
var img_no = new Array();	//img_noを画像オブジェクト宣言
for (i = 0; i < gasu; i++) {
 	img_no[i] = new Image();
  	img_no[i].src = img[i];
}
var gno = 1;
function tim(){
	imgchg()
	setTimeout('tim()',6000);
}
function imgchg() {
	if (document.all) {
    		document.images.main_pic.style.filter="blendTrans()";
    	document.images.main_pic.filters.blendTrans.Apply();
  	}
  	document.images.main_pic.src = img_no[gno].src; // NN4,IE5 共通
  	if (document.all) {
    		document.images.main_pic.filters.blendTrans.Play();
  	}
  	gno = gno + 1;
  	if (gno > (gasu - 1)) gno = 0;
}