function toggle(id,text){
    d=document.getElementById(id);
    d.innerHTML=text;
}
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function MM_goToURL() { //v3.0
  var i, args=MM_goToURL.arguments; document.MM_returnValue = false;
  for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");
}

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

 function checkEnter(e){ //e is event object passed from function invocation
 var characterCode;
 if(e && e.which){ //if which property of event object is supported (NN4)
 e = e;
 characterCode = e.which; //character code is contained in NN4's which property
 }
 else{
 e = event;
 characterCode = e.keyCode; //character code is contained in IE's keyCode property
 }
 return (characterCode != 13);

 }
function radioCheck(radio){
    return (radio.checked);

}

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 isEmpty (str){
    return (Trim(str) == "");
}
function numberCheck(str)
{
    var ValidChars = "0123456789";
    var IsNumber=true;
    var Char;
    for (i = 0; i < str.length && IsNumber == true; i++) 
    { 
        Char = str.charAt(i); 
        if (ValidChars.indexOf(Char) == -1) 
        {
        IsNumber = false;
        }
    }
    return IsNumber;   
}
function emailCheck (str){
    validRegExp = /^[^@]+@[^@]+.[a-z]{2,}$/i;
    return (str.search(validRegExp) != -1);
}


function checkEmpty(field){
    if (isEmpty(field.value)){
        alert("Debe rellenar el campo");
        field.focus();
        field.select();
        return true;
    }
    else{
        return false;
    }

}
function radioCheck(radio){
    return (radio.checked);

}
function cardNumberCheck(cardNumber) {
	if (!numberCheck(cardNumber)) return false;
	return (cardNumber.length ==16);
}


function cardDateCheck(month, year){
	if (!numberCheck(month)) return false;
	if (!numberCheck(year)) return false;
	var mydate = new Date();
	var iYear = parseInt(year);
	var iMonth = parseInt(month);
	if (iYear < mydate.getYear()) return false;
	if ((iMonth < 1) || (iMonth > 12)) return false;
	if ((iYear ==  mydate.getYear()) && (iMonth < mydate.getMonth() + 1)) return false;
	return true;	
}


function favoritos() {
if ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4) && (navigator.appVersion.indexOf("Win")!=-1)) {
var url="http://www.aistel.com";
var title="Aistel";
window.external.addFavorite(url,title);
}
else {
var msg = "Para añadir aistel.com a los favoritos de tu navegador pulsa la combinación de teclas  (CTRL-D)";

alert(msg);
}
}