function menu_link(num)
{
	switch(num)

	{

	  case 1:window.location="index.htm" ;break;

	  case 2:window.location="mission.htm" ;break;

	  case 3:window.location="contribute.htm" ;break;
	  
	  case 4:window.location="photo_gallery.htm" ;break;


	 


	}
}