/*
 Menu animation effects 
*/
function doHover(tbl,idx,cls){
  var t,d;
  
  t=document.getElementById(tbl);   
  if(t==null)
    return;
  
  d=t.getElementsByTagName("TD");
  if(d==null)
    return;
  if(d.length<=idx)
    return;
  
  d[idx].className=cls;
}

function doClick(id,idx,cls){
  var t,d;
  
  t=document.getElementById(id);   
  if(t==null)
    return;
  
  d=t.getElementsByTagName("span");
  if(d==null)
    return;
  if(d.length<=idx)
    return;
  
  var cls_old = d[idx].className;
  for (i = 0; i < d.length; i++)
  {
    // reset style
    if(d[i].className == cls)
	   d[i].className = cls_old;
  }
  d[idx].className=cls;
}