var VisibleMenu = ''; // 記錄目前顯示的子選單的 ID

// 顯示或隱藏子選單
function switchMenu( theMainMenu, theSubMenu, theEvent ){
    var SubMenu = document.getElementById( theSubMenu );
    if( SubMenu.style.display == 'none' ){ // 顯示子選單
        SubMenu.style.display = 'block';
        hideMenu(); // 隱藏子選單
        VisibleMenu = theSubMenu;
    }
    else{ // 隱藏子選單
        if( theEvent != 'MouseOver' || VisibleMenu != theSubMenu ){
            SubMenu.style.display = 'none';
            VisibleMenu = '';
        }
    }
}

// 隱藏子選單
function hideMenu(){
    if( VisibleMenu != '' ){
        document.getElementById( VisibleMenu ).style.display = 'none';
    }
    VisibleMenu = '';
}
function com_show_sub_tree(obj){
	eParent = obj.parentNode;
	var x=eParent.getElementsByTagName("ul");
	if(x[0].style.display=="none"){
		x[0].style.display="block";
		obj.getElementsByTagName("span")[0].innerHTML="-";
	}
	else{
		x[0].style.display="none";
		obj.getElementsByTagName("span")[0].innerHTML="+";
	}
	
	
}

//check if the next sibling node is an element node
function com_get_nextsibling(n)
{
	let x=n.nextSibling;
	if(x!=null){
		while (x.nodeType!=1)
		{
			x=x.nextSibling;
			if(x==null){
				return(null);
			}
		}
	}
	return x;
}

function com_guid(trim = true,hyphen= false) {//guid生成器
	if(trim){
		if(hyphen){
			var tmp='xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx';
		}
		else{
			var tmp='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
		}
	}
	else{
		if(hyphen){
			var tmp='{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}';
		}
		else{
			var tmp='{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx}';
		}
	}
	
	var guid=tmp.replace(/[xy]/g, function(c) {
        var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
        return v.toString(16);
    });
    return guid.toUpperCase();
}
function com_uuid() {//guid生成器
	let tmp='xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx';
	let uuid=tmp.replace(/[xy]/g, function(c) {
        var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
        return v.toString(16);
    });
    return uuid.toLowerCase();
}
function com_xmlToString(elem){
	var serialized;
	try{
		serializer = new XMLSerializer();
		serialized = serializer.serializeToString(elem);
	}
	catch(e){
		serialized = elem.xml;
	}
	return(serialized);
}

function com_getPaliReal(inStr){
	var paliletter="abcdefghijklmnoprstuvyāīūṅñṭḍṇḷṃ";
	var output="";
	inStr = inStr.toLowerCase();
	inStr = inStr.replace(/ṁ/g,"ṃ");
	inStr = inStr.replace(/ŋ/g,"ṃ");
	for(x in inStr){
		if(paliletter.indexOf(inStr[x])!=-1){
			output+=inStr[x];
		}
	}
	return(output);
}


function getCookie(c_name)
{
	if (document.cookie.length>0)
	{ 
		c_start=document.cookie.indexOf(c_name + "=")
		if (c_start!=-1)
		{ 
			c_start=c_start + c_name.length+1 
			c_end=document.cookie.indexOf(";",c_start)
			if (c_end==-1) 
				c_end=document.cookie.length
			return unescape(document.cookie.substring(c_start,c_end))
		} 
	}
	else{
		return ""		
	}

}

function setCookie(c_name,value,expiredays)
{
	var exdate=new Date()
	exdate.setDate(exdate.getDate()+expiredays)
	document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : "; expires="+exdate.toGMTString()+";path=/")
}