/* ----------------------------------------------*/
//  白黒反転
/* ----------------------------------------------*/

xray_flg = 0;
function ch_xray(){
    if(xray_flg == 0){
        id1.style.filter = "Xray()";
        xray_flg = 1;
    } else {
        id1.style.filter = "";
        xray_flg = 0;
    }
}