/* DROPDOWN MENU */

var mainMenuID = 'mainmenu';
var dropdownMenuID = 'dropdownID';
var subMenuClass = 'submenu';
var dropdownMenuClass = 'dropdownmenu';
var iframeID = 'iframeID';

var dropdownMenues = new Array();
var dropdownMenuIframes = new Array(); /* Only used for IE */
var stillHover, delayHide;
var hoverOffDelay = 500;
var minWidthPixels = 120; /* Only used for IE */
var setWidth = '10em'; /* Only used for IE */

function menuInit()
{
    var subMenuItemsCount = 0;
	var elementItems = document.getElementById( mainMenuID ).getElementsByTagName( 'div' );

	for( var k = 0; k < elementItems.length; k++ )
	{
		if( elementItems[k].className == subMenuClass )
		{
			dropdownMenues[subMenuItemsCount] = elementItems[k].id = dropdownMenuID + subMenuItemsCount;

            elementItems[k].className = dropdownMenuClass;
                
            if( /MSIE [567]/.test( navigator.appVersion ) ) 
            {
                var newIframe = document.createElement( 'iframe' );
    
           		dropdownMenuIframes[subMenuItemsCount] = iframeID + subMenuItemsCount;
                newIframe.setAttribute( 'id', dropdownMenuIframes[subMenuItemsCount] );
                elementItems[k].appendChild( newIframe );
            }

			subMenuItemsCount++;
		}
	}
}

function switchDropdown( element )
{
    var getElement = element.nextSibling.id;
    
    if( !getElement ) /* Triggered only by IE, as element order differs from others */
    {
        getElement = element.nextSibling.nextSibling.id;
    }
    
    var idPattern = new RegExp( '^' + dropdownMenuID + '(\\d+)' );

	if( idPattern.test( getElement ) )
	{
		var currentMenuNumber = RegExp.$1;
	}
	else
	{
		return false;
	}
	
	for( var menuCount = 0; menuCount < dropdownMenues.length; menuCount++ )
	{
		if( menuCount == currentMenuNumber )
		{
			showDropdown( menuCount );
		}
		else
		{
			hideDropdown( menuCount );
		}
	}
	stillHover = true;
}

function showDropdown( menuNumber )
{
    var currentMenu = document.getElementById( dropdownMenues[menuNumber] );
	currentMenu.style.display = 'block';
    currentMenu.parentNode.firstChild.className = 'menuhover';

    if( /MSIE [567]/.test( navigator.appVersion ) ) /* Only if IE */
    {
        var currentIframe = document.getElementById( dropdownMenuIframes[menuNumber] );

        if( currentMenu.offsetWidth < minWidthPixels )
        {
            currentMenu.style.width = setWidth;
        }

        currentIframe.style.height = currentMenu.offsetHeight;
        currentIframe.style.width = currentMenu.offsetWidth;
    }
}

function menuHover()
{
	stillHover = true;
}

function tryHideAllDropdowns()
{
	stillHover = false;
	clearTimeout( delayHide );
	delayHide = setTimeout( 'hideAllDropdowns()', hoverOffDelay );
}

function hideAllDropdowns()
{
	if( !stillHover )
	{
		for( var menuCount = 0; menuCount < dropdownMenues.length; menuCount++ )
		{
			hideDropdown( menuCount );
		}
	}
}

function hideDropdown( menuNumber )
{
    var currentMenu = document.getElementById( dropdownMenues[menuNumber] );
	currentMenu.style.display = 'none';
    currentMenu.parentNode.firstChild.className = '';
}