var activeMenuID = -1 ;
//var menuList = new Array("mainmenu01" , "mainmenu02" , "mainmenu03" , "mainmenu04" , "mainmenu05" , "mainmenu06" , "mainmenu07" , "mainmenu08" , "mainmenu09" , "mainmenu10" , "mainmenu11" , "mainmenu12" )
var MenuBaseName = "mainmenu"
var ChildMenuBaseName = "childmenu"
function ActiveMenu( strMenuName )
{
	menuID = parseFloat( strMenuName.substr(strMenuName.length - 2) )
	if ( menuID != activeMenuID )
	{
		var fullFileName = document.images[strMenuName].src ;
		var extendName = fullFileName.substr(fullFileName.lastIndexOf(".")) ;
		if ( -1 != activeMenuID )
		{
			var imageName = MenuBaseName + FormatNumToStr(activeMenuID , 2) ;
			document.images[imageName].src = SITEROOT + "i/" + imageName + extendName ;
			ShowChild( activeMenuID , false) ;
		}

		var imageName = MenuBaseName + FormatNumToStr(menuID , 2) ;
		document.images[imageName].src = SITEROOT + "i/" + imageName + "o" + extendName ;
		ShowChild(menuID,true) ;
		activeMenuID = menuID ;
	}
	
}

function ShowChild(intMenuID , blnShow)
{
	ChildMenuName = ChildMenuBaseName + FormatNumToStr(intMenuID , 2) ;
	var strDisplay ;
	if (blnShow)
	{
		strDisplay = "block" ;
	}
	else
	{
		strDisplay = "none" ;
	}
 	eval(ChildMenuName).style.display = strDisplay ;
}