btn = new Array(9);
btn[0] = "btn0";
btn[1] = "btn1";
btn[2] = "btn2";
btn[3] = "btn3";
btn[4] = "btn4";
btn[5] = "btn5";
btn[6] = "btn6";
btn[7] = "btn7";
btn[8] = "btn8";

function btndflt() {
    	//alert(top.frames.length);
	if (top.frames.length != 0) {
		if (top.frames[0].document.images.length != 0) {
			for (i = 0; i < btn.length; i++) {
				top.navi.document.images[btn[i]].src = "http://www.icabs.ac.jp/images/btn_"+i+".gif";
			}
		}
	}
}

function btncng(n) {
	for (i = 0; i < btn.length; i++) {
		if ( n == i ) {
			top.navi.document.images[btn[i]].src = "http://www.icabs.ac.jp/images/btn_"+i+"_atv.gif";
		}
	}
}