function switchControl(id)
{
	for (i = 1; i < 20; i++)
	{
		var ctrl = document.getElementById('main_menu_' + i);
		if (ctrl == null) break;
		ctrl.style.display = "none";
	}
	
	var c = document.getElementById(id);
	if (c == null) return;
	c.style.display = "block";
}


function nTabs(thisObj,Num){
if(thisObj.className == "active")return;
var tabObj = thisObj.parentNode.id;
var tabList = document.getElementById(tabObj).getElementsByTagName("li");
for(i=0; i <tabList.length; i++)
{
  if (i == Num)
  {
   thisObj.className = "active"; 
      document.getElementById(tabObj+"_Content"+i).style.display = "block";
  }else{
   tabList[i].className = "normal"; 
   document.getElementById(tabObj+"_Content"+i).style.display = "none";
  }
} 
}