function showmenu(id){
	show(id);
	document.getElementById(id).style.position = "absolute";
}

function show(id){
	document.getElementById(id).style.display = "block";
}

function hidemenu(id){
	document.getElementById(id).style.display = "none";
}

function change(id){
	var display = document.getElementById(id).style.display;
	if(display == "block"){
		hidemenu(id);
	}else{
		show(id);
	}
}

function $(id){
	return document.getElementById(id);
}

function tag(tag){
	var obj = document.getElementById('content');
	var start = obj.selectionStart;
	var end = obj.selectionEnd;
	var text = obj.value;
	var length = obj.textLength;
	var opentag = '['+tag+']';
	var closetag = '[/'+tag+']';

	if(document.selection){
		obj.focus();
		var sel = document.selection.createRange();
		sel.text = opentag+sel.text+closetag;
	}
}