if(document.images) {
pics = new Array();
pics[1] = new Image();
pics[1].src = "images/sn/myspace.png";
pics[2] = new Image();
pics[2].src = "images/sn/myspace_o.png";
pics[3] = new Image();
pics[3].src = "images/sn/facebook.png";
pics[4] = new Image();
pics[4].src = "images/sn/facebook_o.png";
pics[5] = new Image();
pics[5].src = "images/sn/twitter.png";
pics[6] = new Image();
pics[6].src = "images/sn/twitter_o.png";
}

function changer(from,to) {
if(document.images) {
document.images[from].src = pics[to].src;
}
}