function $(id) {
	return document.getElementById(id);
}
function getcookie(name) {
	var cookie_start = document.cookie.indexOf(name);
	var cookie_end = document.cookie.indexOf(";", cookie_start);
	return cookie_start == -1 ? '' : unescape(document.cookie.substring(cookie_start + name.length + 1, (cookie_end > cookie_start ? cookie_end : document.cookie.length)));
}



function mb_strlen(str) {
	var len = 0;
	for(var i = 0; i < str.length; i++) {
		len += str.charCodeAt(i) < 0 || str.charCodeAt(i) > 255 ? (charset == 'utf-8' ? 3 : 2) : 1;
	}
	return len;
}

function mb_cutstr(str, maxlen, dot) {
	var len = 0;
	var ret = '';
	var dot = !dot ? '...' : '';
	maxlen = maxlen - dot.length;
	for(var i = 0; i < str.length; i++) {
		len += str.charCodeAt(i) < 0 || str.charCodeAt(i) > 255 ? (charset == 'utf-8' ? 3 : 2) : 1;
		if(len > maxlen) {
			ret += dot;
			break;
		}
		ret += str.substr(i, 1);
	}
	return ret;
}



function strlen(str) {
	return (is_ie && str.indexOf('\n') != -1) ? str.replace(/\r?\n/g, '_').length : str.length;
}

function updatestring(str1, str2, clear) {
	str2 = '_' + str2 + '_';
	return clear ? str1.replace(str2, '') : (str1.indexOf(str2) == -1 ? str1 + str2 : str1);
}

function toggle_collapse(objname, noimg, complex, lang) {
	var obj = $(objname);
	if(obj) {
		obj.style.display = obj.style.display == '' ? 'none' : '';
		var collapsed = getcookie('discuz_collapse');
		collapsed = updatestring(collapsed, objname, !obj.style.display);
	}
	if(!noimg) {
		var img = $(objname + '_img');
		if(img.tagName != 'IMG') {
			if(img.className.indexOf('_yes') == -1) {
				img.className = img.className.replace(/_no/, '_yes');
				if(lang) {
					img.innerHTML = lang[0];
				}
			} else {
				img.className = img.className.replace(/_yes/, '_no');
				if(lang) {
					img.innerHTML = lang[1];
				}
			}
		} else {
			img.src = img.src.indexOf('_yes.gif') == -1 ? img.src.replace(/_no\.gif/, '_yes\.gif') : img.src.replace(/_yes\.gif/, '_no\.gif');
		}
		img.blur();
	}
	if(complex) {
		var objc = $(objname + '_c');
		objc.className = objc.className == 'c_header' ? 'c_header closenode' : 'c_header';
	}

}



function trim(str) {
	return (str + '').replace(/(\s+)$/g, '').replace(/^\s+/g, '');
}