var timeout	= 100;
var closetimer	= 0;

function showDropDownMenu(ddID)
{
	cancelclosetime();
	switch(ddID)
	{
		case 'dd-industries':
			$('#dd-economics').fadeOut('50');
			$('#dd-services').fadeOut('50');
			$('#dd-about-us').fadeOut('50');
			break;
			
		case 'dd-economics':
			$('#dd-industries').fadeOut('50');
			$('#dd-services').fadeOut('50');
			$('#dd-about-us').fadeOut('50');
			break;
			
		case 'dd-services':
			$('#dd-industries').fadeOut('50');
			$('#dd-economics').fadeOut('50');
			$('#dd-about-us').fadeOut('50');
			break;
			
		case 'dd-about-us':
			$('#dd-industries').fadeOut('50');
			$('#dd-economics').fadeOut('50');
			$('#dd-services').fadeOut('50');
			break;
	}
	$('#'+ddID).fadeIn('100');
}

function hideDropdownMenu()
{
	if(closetimer)
	{
		$('#dd-industries').fadeOut('50');
		$('#dd-economics').fadeOut('50');
		$('#dd-services').fadeOut('50');
		$('#dd-about-us').fadeOut('50');
	}
}

// go close timer
function closetime()
{
	closetimer = window.setTimeout(hideDropdownMenu, timeout);
}

// cancel close timer
function cancelclosetime()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}