if (document.images) { 

var img1on = new Image();
img1on.src = "http://ip-bizex.e-side.co.jp/images/01000-summary_on.gif"; 
var img1off = new Image();
img1off.src = "http://ip-bizex.e-side.co.jp/images/01000-summary.gif";

var img2on = new Image();
img2on.src = "http://ip-bizex.e-side.co.jp/images/02000-conference_on.gif"; 
var img2off = new Image();
img2off.src = "http://ip-bizex.e-side.co.jp/images/02000-conference.gif";

var img3on = new Image();
img3on.src = "http://ip-bizex.e-side.co.jp/images/03000-exhibition_on.gif"; 
var img3off = new Image();
img3off.src = "http://ip-bizex.e-side.co.jp/images/03000-exhibition.gif";

var img4on = new Image();
img4on.src = "http://ip-bizex.e-side.co.jp/images/04000-list_on.gif"; 
var img4off = new Image();
img4off.src = "http://ip-bizex.e-side.co.jp/images/04000-list.gif";

var img5on = new Image();
img5on.src = "http://ip-bizex.e-side.co.jp/images/05000-access_on.gif"; 
var img5off = new Image();
img5off.src = "http://ip-bizex.e-side.co.jp/images/05000-access.gif";

var img6on = new Image();
img6on.src = "http://ip-bizex.e-side.co.jp/images/06000-inquiry_on.gif"; 
var img6off = new Image();
img6off.src = "http://ip-bizex.e-side.co.jp/images/06000-inquiry.gif";

var img7on = new Image();
img7on.src = "http://ip-bizex.e-side.co.jp/images/home_on.gif"; 
var img7off = new Image();
img7off.src = "http://ip-bizex.e-side.co.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'); 
} 

}