agent = navigator.appVersion 

if (eval(agent.substring(0,1)) >= 4) {
about = new Image(40,255);
about.src = "images/b_about2.gif";
about_o = new Image(40,255);
about_o.src = "images/b_about2_o.gif";
contact = new Image(39,255);
contact.src = "images/b_contact2.gif";
contact_o = new Image(39,255);
contact_o.src = "images/b_contact2_o.gif";
workshop = new Image(40,255);
workshop.src = "images/b_workshop2.gif";
workshop_o = new Image(40,255);
workshop_o.src = "images/b_workshop2_o.gif";
perform = new Image(41,255);
perform.src = "images/b_perform2.gif";
perform_o = new Image(41,255);
perform_o.src = "images/b_perform2_o.gif";
refer = new Image(42,255);
refer.src = "images/b_refer2.gif";
refer_o = new Image(42,255);
refer_o.src = "images/b_refer2_o.gif";
weekly = new Image(134,130);
weekly.src = "images/b_weekly.gif";
weekly_o = new Image(134,130);
weekly_o.src = "images/b_weekly_o.gif";
}

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