biob=new Image();
biob.src="images/biob.jpg";
homeb=new Image();
homeb.src="images/homeb.jpg";
galb=new Image();
galb.src="images/galb.jpg";
bioa=new Image();
bioa.src="images/bioa.jpg";
homea=new Image();
homea.src="images/homea.jpg";
gala=new Image();
gala.src="images/gala.jpg";
x=new Image();
x.src="images/x.gif";