function switchTab(tabid)
{
    var obj;
    var obj2;
	for(i=1; i <=6; i++)
	{
		obj=document.getElementById("navtab_"+i);
		obj2=document.getElementById("tabcontent"+i);
		if (obj!=null)
		{
   		   if (i==tabid)
		   {
		     obj.className="select";
		     if (obj2!=null)
		        obj2.style.display='block';
		   }
		   else
		   {
   		     obj.className="unselect";
		     if (obj2!=null)
		        obj2.style.display='none';
		   }
		}
    } 
}

function switchChannel(tabid)
{
    var obj;
    var obj2;
	for(i=1; i <=6; i++)
	{
		obj=document.getElementById("channeltab_"+i);
		obj2=document.getElementById("channel"+i);
		if (obj!=null)
		{
   		   if (i==tabid)
		   {
		     obj.className="select";
		     if (obj2!=null)
		        obj2.style.display='block';
		   }
		   else
		   {
   		     obj.className="unselect";
		     if (obj2!=null)
		        obj2.style.display='none';
		   }
		}
    } 
}