function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
MM_preloadImages('/images/menubg01.jpg','/images/menubg02.jpg','/images/menubg03.jpg','/images/menubg04.jpg','/images/menubg05.jpg','/images/menubg11.jpg','/images/menubg12.jpg','/images/menubg13.jpg','/images/menubg14.jpg','/images/menubg15.jpg');

function switchmenu(j){
		document.getElementById("submenu01").style.display='none';
		document.getElementById("submenu02").style.display='none';
		//document.getElementById("menu").style.backgroundImage="url(images/menubg0"+j+".jpg)";
		document.getElementById("menu").className="menu"+j;
		if (j==2 || j==7){document.getElementById("submenu01").style.display='block';}
		if (j==3 || j==8){document.getElementById("submenu02").style.display='block';}
}