btnImgOff=new Array(7);
btnImgOver=new Array(7);
btnImgOn=new Array(7);
btnFlg=0;
for(i=1;i<=6;i++){
		btnImgOff[i]=new Image();
		btnImgOff[i].src="../img/btn/off/off"+i+"1.gif";
		
		btnImgOver[i]=new Image();
		btnImgOver[i].src="../img/btn/on/on"+i+"2.gif";

		btnImgOn[i]=new Image();
		btnImgOn[i].src="../img/btn/off/off"+i+"1.gif";
}

function btnCtrl(posNum,sitNum){
	if(sitNum==3){
			if(btnFlg!=0){
				document.images["spot"+btnFlg].src=btnImgOff[btnFlg].src;
			}
			document.images["spot"+posNum].src=btnImgOn[posNum].src;
			btnFlg=posNum;
	}else{
			if(btnFlg!=posNum){
				if(sitNum==1){
					document.images["spot"+posNum].src=btnImgOff[posNum].src;
				}
				if(sitNum==2){
					document.images["spot"+posNum].src=btnImgOver[posNum].src;
				}
			}

	 } 
}