opt_a=new Array ();
   opt_b=new Array ();
        
   opt_a[1]=new Image ();
   opt_b[1]=new Image ();
   opt_a[1].src="/images/simple/opt_on1.gif";
   opt_b[1].src="/images/simple/opt_off1.gif";
        
   opt_a[2]=new Image ();
   opt_b[2]=new Image ();
   opt_a[2].src="/images/simple/opt_on2.gif";
   opt_b[2].src="/images/simple/opt_off2.gif";
        
   opt_a[3]=new Image ();
   opt_b[3]=new Image ();
   opt_a[3].src="/images/simple/opt_on3.gif";
   opt_b[3].src="/images/simple/opt_off3.gif";
        
   opt_a[4]=new Image ();
   opt_b[4]=new Image ();
   opt_a[4].src="/images/simple/opt_on4.gif";
   opt_b[4].src="/images/simple/opt_off4.gif";
        
   opt_a[5]=new Image ();
   opt_b[5]=new Image ();
   opt_a[5].src="/images/simple/opt_on5.gif";
   opt_b[5].src="/images/simple/opt_off5.gif";
        
   opt_a[6]=new Image ();
   opt_b[6]=new Image ();
   opt_a[6].src="/images/simple/opt_on6.gif";
   opt_b[6].src="/images/simple/opt_off6.gif";
        
   opt_a[7]=new Image ();
   opt_b[7]=new Image ();
   opt_a[7].src="/images/simple/opt_on7.gif";
   opt_b[7].src="/images/simple/opt_off7.gif";
        
   function On (number) {
     document.images["option"+number].src=opt_a[number].src;
   }
   function Off (number) {
     document.images["option"+number].src=opt_b[number].src;
   }