function show(layerName) {
	document.getElementById(layerName).style.display ='block';
}

function hide(layerName) {
	document.getElementById(layerName).style.display = 'none';
}

function showHideDiv(idContainerr,idShow,containerrButon,buton)	{
	change(containerrButon,buton);
	continer = document.getElementById(idContainerr); 
	divs = continer.getElementsByTagName("div"); 
	for (var i = 0; i < divs.length; i++) { 
		classDiv= divs[i].className; 
			if ( classDiv == "art_home") { 
  				 hide(divs[i].id);
			}
			show(idShow) ;
	}
}

function change(containerrButon,id_buton) {
	continer = document.getElementById(containerrButon); 
	auri = continer.getElementsByTagName("a"); 
	for (var i = 0; i < auri.length; i++) {
		auri[i].className="nonslect";
	}
	document.getElementById(id_buton).className ='select';
}