agent = navigator.appVersion 

if (eval(agent.substring(0,1)) >= 4) {
about = new Image(29,157);
about.src = "images/sb_about1.gif";
about_o = new Image(29,157);
about_o.src = "images/sb_about1_o.gif";
contact = new Image(26,157);
contact.src = "images/sb_contact2.gif";
contact_o = new Image(26,157);
contact_o.src = "images/sb_contact2_o.gif";
workshop = new Image(28,144);
workshop.src = "images/sb_workshop2.gif";
workshop_o = new Image(28,144);
workshop_o.src = "images/sb_workshop2_o.gif";
perform = new Image(28,157);
perform.src = "images/sb_perform1.gif";
perform_o = new Image(28,157);
perform_o.src = "images/sb_perform1_o.gif";
refer = new Image(28,144);
refer.src = "images/sb_refer1.gif";
refer_o = new Image(28,144);
refer_o.src = "images/sb_refer1_o.gif";
weekly = new Image(52,125);
weekly.src = "images/sb_weekly1.gif";
weekly_o = new Image(52,125);
weekly_o.src = "images/sb_weekly1_o.gif";
}

function ChangeImg(imgDocID,imgObjName) {
	document.images[imgDocID].src = eval(imgObjName + ".src") }