function todos(selTodas, variable, formulario){
  for (var i = 0; i < eval ("document."+formulario+"."+variable+".length") ; i++)
    eval("document."+formulario+"."+variable+".options[i].selected="+ selTodas);
}

function selectedValues(vars, combo, formulario){
  var arr = new Array();
  var strFinal = vars.split("&#039;").join("");
  strFinal = strFinal.split("'").join("");
  strFinal = strFinal.split(" ").join("");
  arr = strFinal.split(",");

  for (j=0; j<eval("document."+formulario+"."+combo+".length") ; j++){
    for (i=0;i<arr.length;i++){
      if(arr[i] == eval("document."+formulario+"."+combo+".options[" + j + "].value")){
        eval("document."+formulario+"."+combo+".options[" + j + "].selected=true");
      }
    }
  }
}