function changeDisplay(elemID, iconID ){
var elem = document.getElementById(elemID);
var icon = document.getElementById(iconID);

if( elem.style.display=="none"){
elem.style.display="block";
icon.src = "img/common_img/icon_02.gif";
} else {
elem.style.display="none";
icon.src = "img/common_img/icon_01.gif";
}

}