function supportDOM() {
	return document.getElementById && ( window.attachEvent || window.addEventListener);
}

function ie501win() {
	return document.all && !document.fireEvent && !window.opera;
}

function addEvent(obj,evType,fn) {
  if(obj.addEventListener){
    obj.addEventListener(evType,fn,false);
    return true;
  }else if(obj.attachEvent){
    return obj.attachEvent('on'+evType,fn);
  }else if(document.all&&(!document.mimeType)){
    eval('obj.on'+evType+'=fn');
	return true;
  }else{
	return false;
  }
}

function removeEvent(obj,evType,fn){
  if(obj.addEventListener){
    obj.removeEventListener(evType,fn,false);
    return true;
  }else if(obj.attachEvent){
    return obj.detachEvent('on'+evType,fn);
  }else if(document.all&&(!document.mimeType)){
    eval('obj.on'+evType+'=null');
	return true;
  }else{
	return false;
  }
}


/* RTVA */
var strrtva='rtva';
var rtvaspeed=3000;
var rtvaindex=0;
var rtva;
function initrtva(){
  rtva=document.getElementById(strrtva).getElementsByTagName('LI');
  switchrtva();
}
function switchrtva(){
  for(var i=0;i<rtva.length;i++) rtva[i].style.visibility='hidden';
  if((rtvaindex+1)<rtva.length) rtvaindex++;
  else rtvaindex=0;
  rtva[rtvaindex].style.visibility='visible';
  setTimeout('switchrtva()',rtvaspeed);
}