//アクティブ化ファンクション
function activate(btn_num){
	switch(btn_num){
	case 1 :
	document.getElementById('itemgn01').src='/include/images/itemgn_01_on.gif';
	break;
	case 2 :
	document.getElementById('itemgn02').src='/include/images/itemgn_02_on.gif';
	break;
	case 3 :
	document.getElementById('itemgn03').src='/include/images/itemgn_03_on.gif';
	break;
	case 4 :
	document.getElementById('itemgn04').src='/include/images/itemgn_04_on.gif';
	break;
	}
}