var active_menu = 'submenu1';
var timeout = '';
function showBlock(div_id)	
{		
	clearTimeout(timeout);
	if (div_id != active_menu) hideBlock(active_menu);
    active_menu = div_id;
	div_id = '#'+div_id;
	$(div_id).fadeIn(250);	
	$(div_id).animate({opacity: 0.9}, 50);  
}
	

function hideBlock(div_id)
{
	 div_id = '#'+div_id;
	$(div_id).fadeOut(250);
}

function hideBlockDelay() 
{
	timeout = setTimeout("hideBlock(active_menu)",1000);	
}