toc1=new Image();
toc1.src='http://static.search.canoe.ca/s-toile/img/header/2007/yahoo_sponsor_fr.gif';
toc2=new Image();
toc2.src='http://static.search.canoe.ca/s-toile/img/trans.gif';

function displayYahoo(){
if (document.theForm.sen[0].checked) {
document.images['logo'].src = toc2.src;
}
else if (document.theForm.sen[1].checked) {
document.images['logo'].src = toc1.src;
}
}