tyou1=new Image();
tyou1.src="i-menu/20a.gif";
tyou2=new Image();
tyou2.src="i-menu/20b.gif";

tyou3=new Image();
tyou3.src="i-menu/30a.gif";
tyou4=new Image();
tyou4.src="i-menu/30b.gif";

tyou5=new Image();
tyou5.src="i-menu/40a.gif";
tyou6=new Image();
tyou6.src="i-menu/40b.gif";

tyou7=new Image();
tyou7.src="i-menu/10a.gif";
tyou8=new Image();
tyou8.src="i-menu/10b.gif";

tyou9=new Image();
tyou9.src="i-menu/topa.gif";
tyou10=new Image();
tyou10.src="i-menu/topb.gif";

tyou11=new Image();
tyou11.src="i-menu/homea.gif";
tyou12=new Image();
tyou12.src="i-menu/homeb.gif";