a_off=new Image;
a_off.src="/head/images/media-off.gif";
a_on=new Image;
a_on.src="/head/images/media-on.gif";
b_off=new Image;
b_off.src="/head/images/ad-off.gif";
b_on=new Image;
b_on.src="/head/images/ad-on.gif";
c_off=new Image;
c_off.src="/head/images/suscribe-off.gif";
c_on=new Image;
c_on.src="/head/images/suscribe-on.gif";
d_off=new Image;
d_off.src="/head/images/contact-off.gif";
d_on=new Image;
d_on.src="/head/images/contact-on.gif";