if (document.images) { 

var img1on = new Image();
img1on.src = "../images/btn_idea_lnk_on.gif"; 
var img1off = new Image();
img1off.src = "../images/btn_idea_lnk.gif";

var img2on = new Image();
img2on.src = "../images/btn_idea_dl_on.gif";
var img2off = new Image();
img2off.src = "../images/btn_idea_dl.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'); 
} 

}