function CorTabela () {
  if (document.getElementsByTagName("tag-modalidades")){
	  var trs= document.getElementById("borda")?document.getElementById("borda").getElementsByTagName("tr"):0;
	  for (var i=0; i<trs.length; i++) {
		if (i%2 == 0) 
			(trs[i].className = "set1");
		else (trs[i].className = "set2");
	  }  
  }
}