function getObject(obj)	{
	var theObj;
	if(document.all) theObj=eval('document.all.'+ obj +'.style');
	if(document.layers) theObj=eval('document.'+ obj);
	if(!document.all && document.getElementById) {
	  var nodeObject = document.getElementById(obj);
	  if ( nodeObject != null ) {
	    theObj = nodeObject.style;
	  }
	}
	return theObj;
}

function show_layer(obj){
	var theObj=getObject(obj);
    theObj.visibility='visible';
}
function hide_layer(obj){
	var theObj=getObject(obj);
	theObj.visibility='hidden';
}

function change_t (tr) {
  tr.style.backgroundColor = "#99D6EB";
}

function unchange_t (tr) {
  tr.style.backgroundColor = "#0099CC";
}

function style_t (tr) {
  document.getElementById(tr).className = "menu_links_to";
}

function unstyle_t (tr) {
  document.getElementById(tr).className = "menu_links_t";
}

function change_f (tr) {
  tr.style.backgroundColor = "#FFCC80";
}

function unchange_f (tr) {
  tr.style.backgroundColor = "#FF9900";
}

function style_f (tr) {
  document.getElementById(tr).className = "menu_links_fo";
}

function unstyle_f (tr) {
  document.getElementById(tr).className = "menu_links_f";
}