/*
	Navigation Menu System for IE4up, Netscape6up, and Opera6up
	copyright(C)2002 SHIN-ICHI ( http://www.h2.dion.ne.jp/~survive/ )
	required boolean : IE4, NN6 and OP6
*/

var objOpenedNaviMenu = null;

var strNaviBarID;    	// NavigationBar DIV ID

var strNaviMenuID;   	// + n	MenuItemTitle TD ID
var strNaviMenuClass;	//    	MenuItemTitle TD and A Class
var strNaviLinkID;  	// + n	MenuItemTitle A ID 

var strMenuBlockID; 	// + n 	MenuItemFloating DIV ID
                     	//    	MenuItemFolating DIV Class --> Don't use this script, but css for desgin
var strMenuItemClass; 	//    	SubItemTitle DIV and A Class


// Navigation System Start Method
function startNaviMenu(NaviBarID, NaviMenuID, NaviMenuClass, NaviLinkID, MenuBlockID, MenuItemClass){

    // init properties
    strNaviBarID	 = NaviBarID;
    strNaviMenuID	 = NaviMenuID;
    strNaviMenuClass = NaviMenuClass;
    strNaviLinkID	 = NaviLinkID;
    strMenuBlockID	 = MenuBlockID;
    strMenuItemClass = MenuItemClass; 

    // event handling
    if(IE4 || OP6){ 
        document.onmouseover = viewNaviMenuIEandOpera; 
	
    }else if(NN6){
        window.addEventListener("mouseover", viewNaviMenuN6, true);
    }
}

// Common Get Object from ID Name
function getObjectFromID(strIDName){
    if( IE4 ){
        return document.all[strIDName];
    }else{
        return document.getElementById(strIDName);
    }
}

// Common Open Menu
function viewNaviMenuCommon(objEvent){

    objPosition = getObjectFromID(strNaviBarID);
    if( objEvent.className == strNaviMenuClass ){

        closeNaviMenu();
        var strThisID = objEvent.id;
        if( strThisID.indexOf(strNaviLinkID) >= 0 ){ 
            strThisID = strThisID.replace(strNaviLinkID, strNaviMenuID)
        }

        objItem = getObjectFromID( strThisID );
        objOpenedNaviMenu = getObjectFromID( strThisID.replace(strNaviMenuID, strMenuBlockID) );

        objOpenedNaviMenu.style.top  = objItem.offsetTop  + objPosition.offsetTop + objPosition.offsetHeight + "px";
        objOpenedNaviMenu.style.left = objItem.offsetLeft + objPosition.offsetLeft + "px";
        objOpenedNaviMenu.style.visibility = "visible";
	
    }else if( objOpenedNaviMenu != null ){

        if( NN6 ){
            if( objEvent.id.indexOf( strMenuBlockID ) >= 0 ){ return; }
            if( objEvent.className == strMenuItemClass ){ return; }

        }else{
            if( objOpenedNaviMenu.contains(objEvent) == true
                || objPosition.contains(objEvent) == true){ return; }
        } 
    	closeNaviMenu();
    }

}

// Internet Explorer 4,5,6 and Opera 6,7 Event Handler
function viewNaviMenuIEandOpera(){
    viewNaviMenuCommon( window.event.srcElement );
}

// Netscape 6,7 Event Handler
function viewNaviMenuN6(eventMouseOver){
    viewNaviMenuCommon( eventMouseOver.target );
}

// Common Close Menu
function closeNaviMenu(){
    if(objOpenedNaviMenu != null){
        objOpenedNaviMenu.style.visibility = "hidden";
    }
    objOpenedNaviMenu = null
}