function toggle(what){
 if(document.getElementById(what).style.display == "none"){
   document.getElementById(what).style.display = "block";
 }else{
   document.getElementById(what).style.display = "none";
 }
}

function index(n) {
	for(i=1;i<=3;i++) {
		document.getElementById('tab'+i).className='nonsel';
		document.getElementById('cont'+i).style.display='none';
	}
	document.getElementById('tab'+n).className='sel';
	document.getElementById('cont'+n).style.display='block';
}

$(function() {
	$('#gallery a').lightBox();
});

function hideshow(num) {
	if (document.getElementById('tree_'+num).style.display=='none') {
		document.getElementById('tree_'+num).style.display = 'block';
		document.getElementById('par_'+num).style.backgroundImage = 'url("http://www.znanie.info/_img/-.jpg")';
	} else {
		document.getElementById('tree_'+num).style.display = 'none';
		document.getElementById('par_'+num).style.backgroundImage = 'url("http://www.znanie.info/_img/+.jpg")';
	}
	return false;
}