// JavaScript Document

function change_class(id, newClass) {
		identity=document.getElementById(id);
		identity.className=newClass;
	}

function show_tab1(tab){

      var tabs = ["","top_cont_1","top_cont_2","top_cont_3"];

        for(i=1; i < tabs.length; i++){
          var obj = document.getElementById(tabs[i]);
          change_class("ttab_nav_"+i, "tab_main_inactive")
          obj.style.display = "none";
        }
          
        var obj = document.getElementById("top_cont_"+tab);
        obj.style.display = "block";
        change_class("ttab_nav_"+tab, "tab_main_active")
      }

function show_tab2(tab){

      var tabs = ["","top_cont_4","top_cont_5","top_cont_6"];

        for(i=1; i < tabs.length; i++){
          var obj = document.getElementById(tabs[i]);          
          obj.style.display = "none";
        }
         for(i=4;i<=6;i++){
		 change_class("ttab_nav_"+i, "tab_main_inactive");
		 }
        var obj = document.getElementById("top_cont_"+tab);
        obj.style.display = "block";
        change_class("ttab_nav_"+tab, "tab_main_active")
      }