function favoritos(){
   if ((navigator.appName == "Microsoft Internet Explorer") &&
         (parseInt(navigator.appVersion)>=4)) {
      window.external.AddFavorite(location.href, document.title);
   } else {
      if(navigator.appName == "Netscape")
         alert("Presione Crtl+D para agregar esta pagina en sus Favoritos");
   }
}

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 habilita(form)
{
    if (form.idavuelta[0].checked == true)
    {    
    form.fregreso.disabled = false;
    }
	else
    {
    form.fregreso.disabled = true;
    }
}

//
//
// FORM VALIDATION (vuelos)
//
//
function validate() {

// Origen no nulo
if (document.frmSearch.origen.value=="") {
	alert('Introduce la ciudad de origen');
	document.frmSearch.origen.focus(); 
	return;
	}
// Destino no nulo
if (document.frmSearch.destino.value=="") {
	alert('Introduce la ciudad de destino');
	document.frmSearch.destino.focus();
	return;
	}

// Fecha Salida Valida
if (isDate(document.frmSearch.fsalida.value)==false) {
	document.frmSearch.fsalida.focus(); 
	return;
	}
	
// Fecha Regreso Valida

if (document.frmSearch.idavuelta[0].checked == true)
    {    
	if (isDate(document.frmSearch.fregreso.value)==false) {
		document.frmSearch.fregreso.focus(); 
		return;
	}
    }
	
// If no errors, submit the form
document.frmSearch.submit();
}

//
//
// FORM VALIDATION (hoteles)
//
//
function validate_h() {

// Ciudad no nulo
if (document.frmSearch.ciudad.value=="") {
	alert('Introduce la ciudad');
	document.frmSearch.ciudad.focus(); 
	return;
	}

// Fecha Salida Valida
if (isDate(document.frmSearch.fsalida.value)==false) {
	document.frmSearch.fsalida.focus(); 
	return;
	}
	
// Fecha Regreso Valida

if (isDate(document.frmSearch.fregreso.value)==false) {
	document.frmSearch.fregreso.focus(); 
	return;
}
	
// If no errors, submit the form
document.frmSearch.submit();
}


//
//
// DATE VALIDATION
//
//

var dtCh= "/";
var minYear=2006;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("El formato de fecha debe ser: dd/mm/aaaa")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Por favor introduzca un mes valido")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Por favor introduzca un dia valido")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert('Por favor introduzca un a'+ String.fromCharCode(241) +'o valido con 4 digitos')
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Por favor introduzca una fecha valida")
		return false
	}
return true
}