function chgimg1(imageNum){
             if (document.images) document.chg1.src = imageNum;
    }
    function chgimg2(imageNum){
             if (document.images) document.chg2.src = imageNum;
    }
    function chgimg3(imageNum){
             if (document.images) document.chg3.src = imageNum;
    }
    function chgimg4(imageNum){
             if (document.images) document.chg4.src = imageNum;
    }
    function chgimg5(imageNum){
             if (document.images) document.chg5.src = imageNum;
    }
    function chgimg6(imageNum){
             if (document.images) document.chg6.src = imageNum;
    }
    function chgimg7(imageNum){
             if (document.images) document.chg7.src = imageNum;
    }
    function chgimg8(imageNum){
             if (document.images) document.chg8.src = imageNum;
    }
    function chgimg9(imageNum){
             if (document.images) document.chg9.src = imageNum;
    }
    function chgimg10(imageNum){
             if (document.images) document.chg10.src = imageNum;
    }
    function chgimg11(imageNum){
             if (document.images) document.chg11.src = imageNum;
    }
    function chgimg12(imageNum){
             if (document.images) document.chg12.src = imageNum;
    }
    function chgimg13(imageNum){
             if (document.images) document.chg13.src = imageNum;
    }
    function chgimg14(imageNum){
             if (document.images) document.chg14.src = imageNum;
    }
    function chgimg15(imageNum){
             if (document.images) document.chg15.src = imageNum;
    }
    function chgimg16(imageNum){
             if (document.images) document.chg16.src = imageNum;
    }
    function chgimg17(imageNum){
             if (document.images) document.chg17.src = imageNum;
    }

// プルダウンメニュー
var openedMenu = null;
var submenuTimer;

//画像メニューにポインタがきた時
function menuOvr(id){

	// 開いているメニューと違うメニューであれば隠す。
	if (openedMenu && openedMenu != id){
		CloseMenu(id);
	}

	// サブウィンドウの表示
	OpenMenu(id);
}

//レイヤメニューの表示
function OpenMenu(id){ 

	if ( document.getElementById ){
		document.getElementById( id ).style.visibility = 'visible';
	}else if ( document.all ){
		document.all( id ).style.visibility = 'visible';
	}else if ( document.layers ){
		document.layers[ id ].visibility = 'show';
	}

	clearTimeout(submenuTimer);

	openedMenu = id;

}

//レイヤメニューの削除
function CloseMenu(){ 

	if ( document.getElementById ){
		document.getElementById( openedMenu ).style.visibility = 'hidden';
	}else if ( document.all ){
		document.all( openedMenu ).style.visibility = 'hidden';
	}else if ( document.layers ){
		document.layers[ openedMenu ].visibility = 'hide';
	}

	openedMenu = null;

}