// JavaScript Document
//funcion encargada de crear el objeto
function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "external")
     anchor.target = "_blank";
 }
}


 function obj_ajax() {         
	try {                 
		 xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");}
	catch (e) {                 
		 try {                          
			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");}
		 catch (E) {                           
			 xmlhttp = false;}
         }
	if (!xmlhttp && typeof XMLHttpRequest!='undefined') {                 
 		xmlhttp = new XMLHttpRequest(); }
  return xmlhttp
 }
 
 function extension(str_filename){
	var i = str_filename.length;
	var slicer = String(slicer)
	var ext = String('')
	do{ 
		slicer = str_filename.slice(i-1,i);
		ext = slicer+ext
		i--
	} 
	while(slicer != '.' && i > 1)
	
	ext = ext.toLowerCase();
	return(ext);
}

function esNumero(valor)
{
	if (esEntero(valor) || esDecimal(valor))
		return true;
	return false;
}

function esEntero(valor)
{
  var checkOK = "0123456789-";
  var checkStr = valor;
  var allValid = true;
  var allNum = "";
  for (k = 0;  k < checkStr.length;  k++)
  {
    ch = checkStr.charAt(k);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }
    allNum += ch;
  }
  if (!allValid)
  {
    return false;
  }
  return true;
}

function esDecimal(valor)
{
  var checkOK = "0123456789-,.";
  var checkStr = valor;
  var allValid = true;
  var decPoints = 0;
  var allNum = "";
  for (k = 0;  k < checkStr.length;  k++)
  {
    ch = checkStr.charAt(k);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }
    if ((ch == ",") || (ch == "."))
    {
      allNum += ".";
      decPoints++;
    }
    else 
		allNum += ch;
  }
  if (!allValid)
    return false;
  if (decPoints > 1 || decPoints == 0)
    return false;
  return true;
}

function Chek_input(campo){
	if (Trim(document.getElementById(campo).value)=="")
		return false;
	return true;
}

function LTrim(s){
	var i=j=0;
	for(i=0; i<=s.length-1; i++)
		if(s.substring(i,i+1) != ' '){
			j=i;
			break;
		}
	return s.substring(j, s.length);
}

function RTrim(s){
	var j=0;
	for(var i=s.length-1; i>-1; i--)
		if(s.substring(i,i+1) != ' '){
			j=i;
			break;
		}
	return s.substring(0, j+1);
}

function Trim(s){
	return LTrim(RTrim(s));
}