obr1=new Image();
obr1.src="pictures/home_r.gif";
obr2=new Image();
obr2.src="pictures/ou_r.gif";
obr3=new Image();
obr3.src="pictures/ud_r.gif";
obr4=new Image();
obr4.src="pictures/ho_r.gif";
obr5=new Image();
obr5.src="pictures/map_r.gif";