var montharray=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")
function contarf(yr,m,d)
{	var today=new Date()
	var todayy=today.getYear()
	if (todayy < 1000)
	todayy+=1900
	var todaym=today.getMonth()
	var todayd=today.getDate()
	var todaystring=montharray[todaym]+" "+todayd+", "+todayy
	var paststring=montharray[m-1]+" "+d+", "+yr
	var difference=(Math.round((Date.parse(todaystring)-Date.parse(paststring))/(24*60*60*1000))*1)
	return difference;
}
function dfechas(formulario)
{	var ano = formulario.anos.selectedIndex +2005 ;
	var mes = formulario.mes.selectedIndex + 1;
	var dia = formulario.dia.selectedIndex + 1;
	
	var ano1 = formulario.anos1.selectedIndex +2005 ;
	var mes1 = formulario.mes1.selectedIndex + 1;
	var dia1 = formulario.dia1.selectedIndex + 1;
		
	var fechai = contarf(ano,mes,dia);
	var fechaf = contarf(ano1,mes1,dia1);
	return  (fechai - fechaf);
}
function ctotal(formulario)
{ 	var combo = " ";
	var combo2 = " ";
	var Mi_Fecha = new Date; 
	formulario.costpgr.value= 0;	
	combo = formulario.program.selectedIndex;
	combo2= formulario.addprogram.selectedIndex;
	var dfecha = dfechas(formulario);
	if (((combo ==3) &&  (dfecha < 6 )) || ((combo2 == 4) && (dfecha < 6 )))  //BWP
	{	alert('Se necesita un mínimo de 6 personas para ingresar al programa BWP');		
	}			
	else
	{				var numero = formulario.npersons.value;
					if ( numero<2 && combo ==1 || numero<2 && combo2 ==2 )  // Jungle Expeditions
					{	alert('Se necesita un mínimo de 2 personas para ingresar  PS04');	
					}
					else	
					{	
						formulario.costpgr.value = calcularmonto(formulario,combo);
						if (formulario.addprogram.selectedIndex != 0)
						{	
						var valor1 = 0;
						var valor2 = 0;
						combo2 = formulario.addprogram.selectedIndex-1;
						valor1 = parseInt(formulario.costpgr.value);
						valor2 = calcularmonto(formulario,combo2);
						formulario.costpgr.value =  valor1 +valor2 
						
						
					}
		}
	}
}
function calcularmonto(formulario,combo)
{	
	var bandera =0;
	var mensaje = " ";
	var costo = 0;
	var dfecha= 0;
	mes = formulario.mes.selectedIndex+1;
	if (combo == 0)    // para  jungle Ps03
	{			
		if (formulario.npersons.value <=4 )
		{  	costo = 180*formulario.npersons.value ;		}
		if ((formulario.npersons.value >=5 ) && (formulario.npersons.value <=10))
		{  	costo = 170*formulario.npersons.value ; 	}
		if ((formulario.npersons.value>=11) && (formulario.npersons.value <=20))
		{  	costo = 160*formulario.npersons.value ; 	}
		if (formulario.npersons.value >=21) 
		{  	costo = 150*formulario.npersons.value ; 	}
	} 
	
	if (combo == 1)    // para  "PS04 - Jungle Expeditions"
	{					if (formulario.npersons.value == 2) 		costo = 450*formulario.npersons.value ; 	
						if (formulario.npersons.value == 3) 		costo = 400*formulario.npersons.value ;  	
						if (formulario.npersons.value > 3) 			costo = 350*formulario.npersons.value ;	
	}
	if (combo == 2)    // para  "PS05 - Mystic Adventure"
	{					costo = 295*formulario.npersons.value ; 
	}
	if (combo == 3)    // para  "BWP - Birdwatchers Program"
	{					costo = 300*formulario.npersons.value ; 
	}
	
	if (formulario.add.selectedIndex != 0)   // para noches adicionales
	{	
		costo = costo + formulario.add.selectedIndex * 50; 
		return costo;
	}
	else
	{ 
		return costo;
	}
	
	
}
function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
  
}
function cambiar1(){
        window.event.srcElement.style.color="#ffffff"
	    window.event.srcElement.style.fontsize="10px"
}
function cambiar2(){
        window.event.srcElement.style.color="#000000"
	    window.event.srcElement.style.fontsize="10px"
}
function isNumber (s)
{   var i;
    var dotAppeared;
    dotAppeared = false;
    if (isEmpty(s)) 
       if (isNumber.arguments.length == 1) return defaultEmptyOK;
       else return (isNumber.arguments[1] == true);
    
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if( i != 0 ) {
            if ( c == "." ) {
                if( !dotAppeared )
                    dotAppeared = true;
                else
                    return false;
            } else     
                if (!isDigit(c)) return false;
        } else { 
            if ( c == "." ) {
                if( !dotAppeared )
                    dotAppeared = true;
                else
                    return false;
            } else     
                if (!isDigit(c) && (c != "-") || (c == "+")) return false;
        }
    }
    return true;
}
function confirmar1()
{
    if(form1.nombre.value==""){	alert("Ingrese su nombre"); document.form1.nombre.focus(); 			return false;       }
    if(form1.email.value==""){alert("Ingrese su Email"); document.form1.email.focus(); 				return false;        }
    if(form1.country.value==""){alert("Ingrese su Pais"); document.form1.country.focus(); 			return false;        }
   	if(form1.phone.value == ""){alert("Ingrese su número Telefónico"); document.form1.phone.focus(); return false;    }
	if(form1.npersons.value == ""){alert("Ingrese el numero de Personas"); document.form1.npersons.focus(); return false;   }
	
	document.form1.action="process.php";
	document.form1.submit();
}
function confirmar()
{
    if(form1.nombre.value==""){
            alert("Ingrese su nombre");
            form1.nombre.focus();
            return false;
        }
   if(form1.phone.value==""){
            alert("Ingrese su número telefónico");
            form1.phone.focus();
            return false;
        }
    if(form1.email.value==""){
            alert("Ingrese su Email");
            form1.email.focus();
            return false;
        }
    if(form1.method.value==""){
            alert("Seleccione la forma de pago");
            form1.method.focus();
            return false;
        }
   if(form1.comments.value==""){
            alert("Ingrese su comentario");
            form1.comments.focus();
            return false;
        }
    if(confirm("are you sure to send")){
        return true;
    }else{
        return false;
    }
}
<!--
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_validateForm() { //v4.0
  var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
  for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
    if (val) { nm=val.name; if ((val=val.value)!="") {
      if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
        if (p<1 || p==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n';
      } else if (test!='R') { num = parseFloat(val);
        if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
        if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
          min=test.substring(8,p); max=test.substring(p+1);
          if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
    } } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is required.\n'; }
  } if (errors) alert('The following error(s) occurred:\n'+errors);
  document.MM_returnValue = (errors == '');
}
function IsMail(YourMail)
{
	var Template = /^[a-z][a-z-_0-9.]+@[a-z-_=>0-9.]+.[a-z]{2,3}$/i //Formato de direccion de correo electronico
	
	if(YourMail.value!="") 
	{
		if (Template.test(YourMail.value)) 
		{							}
		else
		{   alert("El correo Electronico contiene caracteres inválidos");
			YourMail.focus();
			YourMail.select();
		}		
	}
	return false;
}
function IsTexto(texto)
{
	var Template = /^[a-zA-Z ]+$/i //Formato de alfanumerico
		if(texto.value!="") 
	{
		if (Template.test(texto.value)) 
		{							}
		else
		{   alert("El texto ingresado tiene caracteres inválidos");
			texto.focus();
			texto.select();
		}		
	}		
	return false;
}
//-->