var subs_array = new Array("sub1","sub2");
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 = "";
}