function CheckAll(){
      count = document.frm.elements.length;
      for(i=0; i < count; i++){
        if(document.frm.elements[i].checked == 0){document.frm.elements[i].checked = 1;}
      }
    }
    function UncheckAll(){
      count = document.frm.elements.length;
      for(i=0; i < count; i++){
        if(document.frm.elements[i].checked == 1){document.frm.elements[i].checked = 0;}
      }
    }
	function Alternate(elemento){
      var meVeo = document.getElementById(elemento).style.display == "block";
      document.getElementById(elemento).style.display = (meVeo) ? "none" : "block";
    }