var Obef = 'photo0';
var rrr = 'pb1';
function chonc( bId,chaid){
	if(document.getElementById){

		if(bId == Obef){ return; }

		var spab = document.getElementById(bId);
		var tpab = document.getElementById(Obef);

		tpab.style.display = "none";
		spab.style.display = "block";

		Obef = bId;
		chgClass(rrr,'close');
		chgClass(chaid,'open');
		rrr = chaid;
	}
}

function chgClass(i,c){
	if(document.getElementById){
		document.getElementById(i).className=c;
	} 
}