if (document.images) { 

var img1on = new Image();
img1on.src = "../../img/size02on.gif"; 
var img1off = new Image();
img1off.src = "../../img/size02.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'); 
} 

}