var subs_array = new Array("sub1","sub2","sub3","sub4","sub5","sub6");// Put the id's of your hidden divs in this array

function displaySubs(the_sub){

	if (document.getElementById(the_sub).style.display==""){

	document.getElementById(the_sub).style.display = "none";return

  }

  for (i=0;i<subs_array.length;i++){

	var my_sub = document.getElementById(subs_array[i]);

	my_sub.style.display = "none";

	}

  document.getElementById(the_sub).style.display = "";

  }