function setCookie (name, value, expires, path, domain, secure) {
      document.cookie = name + "=" + escape(value) +
        ((expires) ? "; expires=" + expires : "") +
        ((path) ? "; path=" + path : "; path=/") +
        ((domain) ? "; domain=" + domain : "") +
        ((secure) ? "; secure" : "");
}
function getCookie(name) {
	var cookie = " " + document.cookie;
	var search = " " + name + "=";
	var setStr = null;
	var offset = 0;
	var end = 0;
	if (cookie.length > 0) {
		offset = cookie.indexOf(search);
		if (offset != -1) {
			offset += search.length;
			end = cookie.indexOf(";", offset)
			if (end == -1) {
				end = cookie.length;
			}
			setStr = unescape(cookie.substring(offset, end));
		}
	}
	return(setStr);
}
function group_folder_is(id){
	var x=Math.pow(2,id-1);
	var y=group_index;
	return ((y | x) != (y ^ x));
}

function group_folder(id,n){
	var x=(group_folder_is(id)?(n?0:-1):(n?1:0))*Math.pow(2,id-1);
	group_index=x+group_index*1;
	setCookie('group_index',group_index);		
}

function left_menu(n,url,id){
	if(document.getElementById('block_left_menu_'+n).className=='none'){
		document.getElementById('block_left_menu_'+n).className='block';
		document.getElementById('img_left_menu_'+n).src=url+'menu_open.gif';
		group_folder(id,true);
	}else{
		document.getElementById('block_left_menu_'+n).className='none';
		document.getElementById('img_left_menu_'+n).src=url+'menu_close.gif';
		group_folder(id,false);
	}
}