var NS4 = (document.layers)? 1 : 0;
var IE4 = (document.all)? 1 : 0;
var W3C = (document.getElementById)? 1 : 0;

function fNextPic(pId){
	q = -1;
	obj = fGetObject("bpic_"+String(++q));
	while(obj){		
		obj.style.display = "none";
		obj = fGetObject("bpic_"+String(++q));
	}
	
	fGetObject("bpic_"+String(pId)).style.display = "block";
}

function fGetObject(obj_name){
	if(W3C)
		return document.getElementById(obj_name);
	else if(NS4)
		return document.layers[obj_name];
	else
		return window.opener.document.all[obj_name];
}

function fIsNum(tmp){
	var szam = new String(tmp);
	var jok = new String("0123456789");
	for(k=0; k<szam.length; k++){
		if(jok.indexOf(szam.charAt(k)) == -1)
			return false;
	}
	return true;
}