var meiwa = {
		hover:{
			setSrc:function(obj,before,after){
				return obj.getAttribute("src").replace(before,after);
			},
			mouseOver:function(){
				this.setAttribute("src",meiwa.hover.setSrc(this,RegExp("menu_off"),"menu_on"));
			},
			mouseOut:function(){
				this.setAttribute("src",meiwa.hover.setSrc(this,RegExp("menu_on"),"menu_off"));
			},
			main:function(){
				var gnavi = document.getElementById("gnavi");
				var gnaviImg = gnavi.getElementsByTagName("img");
				for(var i=0,len=gnaviImg.length;i<len;i++){
					gnaviImg.item(i).onmouseover = meiwa.hover.mouseOver
					gnaviImg.item(i).onmouseout = meiwa.hover.mouseOut
				}
			}
		}
	};
	window.onload = function(){
		meiwa.hover.main()
	}