// イメージのスワップ
function initRollovers() {
	if (!document.getElementById) return
	
	var aPreLoad = new Array();
	var sTempSrc;
	var aImages = document.getElementsByTagName('img');

	for (var i = 0; i < aImages.length; i++) {		
		if (aImages[i].className == 'over') {
			var src = aImages[i].getAttribute('src');
			var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var hsrc = src.replace(ftype, '_over'+ftype);

			aImages[i].setAttribute('hsrc', hsrc);
			
			aPreLoad[i] = new Image();
			aPreLoad[i].src = hsrc;
			
			aImages[i].onmouseover = function() {
				sTempSrc = this.getAttribute('src');
				this.setAttribute('src', this.getAttribute('hsrc'));
			}	
			
			aImages[i].onmouseout = function() {
				if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_on'+ftype, ftype);
				this.setAttribute('src', sTempSrc);
			}
		}
	}
}

window.onload = initRollovers;//-->



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

function menuOvr(id){
  if (openedMenu && openedMenu != id){
    CloseMenu(id);
  }
  OpenMenu(id);
}

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;
}

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;
}
//-->