function LTrim(str) {
  var whitespace = new String(" \t\n\r");
  var s = new String(str);
  if (whitespace.indexOf(s.charAt(0)) != -1) {
    var j=0, i = s.length;
    while (j < i && whitespace.indexOf(s.charAt(j)) != -1)
    j++;
    s = s.substring(j, i);
  }
  return s;
}
function RTrim(str) {
  var whitespace = new String(" \t\n\r");
  var s = new String(str);
  if (whitespace.indexOf(s.charAt(s.length-1)) != -1) {
    var i = s.length - 1;       // Get length of string
    while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1)
      i--;
    s = s.substring(0, i+1);
  }
  return s;
}
function Trim(str) {
  return RTrim(LTrim(str));
}
function ventana_emergente (pagina) {
var opciones=("toolbar=no,location=yes,width=700,height=500, directories=no, status=no, menubar=no ,scrollbars=yes ,resizable=no , fullscreen=no");
window.open(pagina,"",opciones);
//window.close();
}
function obtener_posicion(id){
	objeto = document.getElementById(id);
	alert(objeto.id+': '+objeto.offsetWidth+"x"+objeto.offsetHeight);
	left = innerLeft(objeto);
	top = innerTop(objeto);
	alert("Posicion para '"+id+"': left "+left+" top "+top);
}
function innerTop(elem){
	var iTop = elem.offsetTop;
	while(elem.offsetParent){
		elem = elem.offsetParent;
		iTop += elem.offsetTop;
	}
	return parseInt(iTop);
}
function innerLeft(elem){
	var iLeft = elem.offsetLeft;
	while(elem.offsetParent){
		elem = elem.offsetParent;
		iLeft += elem.offsetLeft;
	}
	return parseInt(iLeft);
}