var c="pic1";

function id2el(e) {
	if(document.getElementById) e=document.getElementById(e);
	else if(document.all) e=document.all[e];
	else e=null;
	return e;
}

function ro(e) {
	id2el(c).className = "hide";
	id2el(e).className = "show";
	c=e;
}