if (document.images) { 

var img1on = new Image();
img1on.src = "http://www.adass2009.jp/images/01000-committees_on.gif"; 
var img1off = new Image();
img1off.src = "http://www.adass2009.jp/images/01000-committees.gif";

var img2on = new Image();
img2on.src = "http://www.adass2009.jp/images/02000-submissions_on.gif"; 
var img2off = new Image();
img2off.src = "http://www.adass2009.jp/images/02000-submissions.gif";

var img3on = new Image();
img3on.src = "http://www.adass2009.jp/images/03000-instructions_on.gif"; 
var img3off = new Image();
img3off.src = "http://www.adass2009.jp/images/03000-instructions.gif";

var img4on = new Image();
img4on.src = "http://www.adass2009.jp/images/04000-program_on.gif"; 
var img4off = new Image();
img4off.src = "http://www.adass2009.jp/images/04000-program.gif";

var img5on = new Image();
img5on.src = "http://www.adass2009.jp/images/05000-registration_on.gif"; 
var img5off = new Image();
img5off.src = "http://www.adass2009.jp/images/05000-registration.gif";

var img6on = new Image();
img6on.src = "http://www.adass2009.jp/images/06000-accommodation_on.gif"; 
var img6off = new Image();
img6off.src = "http://www.adass2009.jp/images/06000-accommodation.gif";

var img7on = new Image();
img7on.src = "http://www.adass2009.jp/images/07000-social_events_on.gif"; 
var img7off = new Image();
img7off.src = "http://www.adass2009.jp/images/07000-social_events.gif";

var img8on = new Image();
img8on.src = "http://www.adass2009.jp/images/08000-local_info_on.gif"; 
var img8off = new Image();
img8off.src = "http://www.adass2009.jp/images/08000-local_info.gif";

var img9on = new Image();
img9on.src = "http://www.adass2009.jp/images/09000-sponsors_on.gif"; 
var img9off = new Image();
img9off.src = "http://www.adass2009.jp/images/09000-sponsors.gif";

var img10on = new Image();
img10on.src = "http://www.adass2009.jp/10000-poster_on.jpg"; 
var img10off = new Image();
img10off.src = "http://www.adass2009.jp/10000-poster.jpg";


var img11on = new Image();
img11on.src = "http://www.adass2009.jp/11000-demos_bof_on.jpg"; 
var img11off = new Image();
img11off.src = "http://www.adass2009.jp/11000-demos_bof.jpg";

var img12on = new Image();
img12on.src = "http://www.adass2009.jp/images/home_on.gif"; 
var img12off = new Image();
img12off.src = "http://www.adass2009.jp/images/home.gif";

} 


function On(name) { 

if (document.images) { 
document.images[name].src = eval(name + 'on.src'); 
} 

} 


function Off(name) { 

if (document.images) { 
document.images[name].src = eval(name + 'off.src'); 
} 

}