ap="'";

function cb () {
	temp=navigator.userAgent;
	if((parseInt(temp.substring(8,9))>2)&&(temp.substring(0,7)=="Mozilla")){
		return true;
	}
}

if(cb()==true){
	
	offboom = new Image;
	offboom.src = "img/boom.gif";
	onboom = new Image;
	onboom.src = "img/boom_on.gif";
}{
	
	offmail = new Image;
	offmail.src = "img/mail.gif";
	onmail = new Image;
	onmail.src = "img/mail_on.gif";
}