setTimeout or setInterval

On the web site I am building http://dev-rico-v2.virtualhorizons.com/
I would like the menu in the first button "Designer Series" to open shortly after the page loads be visible for about 2 seconds then close. Would I use the setTimeout() or setInterval() function to do this and what would the script look like?

 

I tried setInterval and the menu shows up but I can't close the menu after I clear the Interval.

<script type="text/javascript">

setInterval ( "showMenu()", 1000 );

function showMenu()
{
  // (do something here)   
  Show('designer_menu') 
}
clearInterval ("hideMenu");

function hideMenu()
{
	Hide('designer_menu')
	
}

</script>

Code (markup):

 

ok, I figured it out

	//call showMenu function when page loads	
	  setTimeout ("showMenu()",1000);
		
	//show menu
	function showMenu()	{	   
	  Show('designer_menu');
	   setTimeout ( "hideMenu()", 2000 );	   
	}
	
	//hide menu
	function hideMenu()	{	
	   Hide('designer_menu');		   
	}

Code (markup):