var DHTML = (document.getElementById || document.all || document.layers);

function getObj(name){
	if (document.getElementById) {
	  	this.obj = document.getElementById(name);
		this.style = document.getElementById(name).style;
	} else if (document.all) {
		this.obj = document.all[name];
		this.style = document.all[name].style;
	} else if (document.layers) {
		this.obj = document.layers[name];
		this.style = document.layers[name];
	}
}

function hideDiv(div_id) {
	if (!DHTML) return;
	var x = new getObj(div_id);
	x.style.visibility = 'hidden';
	s.style.display = 'none';
}

function showDiv(div_id) {
	if (!DHTML) return;
	var x = new getObj(div_id);
	x.style.visibility = 'visible';
	s.style.display = 'block';
}

var div_id_prev = '';

function rozwin(div_id){
	if(div_id != '') { 
		hideDiv(div_id); 
	}
	if(div_id != div_id_prev) { 
		showDiv(div_id); 
	}
	if(div_id == div_id_prev) { 
		div_id_prev = ''; 
	} else { 
		div_id_prev = div_id; 
	}
}