function mostrar(formulario,index01)
{
	
	var index01=document.forms.form.select4.selectedIndex; 
	
      if (index01!=0)
	{ 
	
	div=window.document.getElementById("boton1");
                        div.style.display="block";
	div=window.document.getElementById("boton3");
                        div.style.display="none";
	//form.ciudad.disabled=true;
	}
	else {
	
	div=window.document.getElementById("boton1");
                        div.style.display="none";
		div=window.document.getElementById("boton3");
                        div.style.display="block";
	
	}
	//div=window.document.getElementById("boton1");
     //                   div.style.display="block";
	//div=window.document.getElementById("boton3");
    //                    div.style.display="none";
}


function cambia_fleet(form,valor)
	{
	 form.select4.disabled=false;
     siteopt = new Array;
     tot = siteopt.length;
     lst = tot;
	 
if (valor==0)
	{
	form.select4.disabled=true;
	form.select4.selectedIndex=0;
	div=window.document.getElementById("boton1");
                        div.style.display="none";
		div=window.document.getElementById("boton3");
                        div.style.display="block";
	}
	
	switch(form.fleet.selectedIndex){

	case 1: //Aircraft
			siteopt[0] = new Option("Select a Aircraft");
			siteopt[1] = new Option("Boeing 767-300F","boeing-767-300F/");
			siteopt[2] = new Option("Boeing 737-200F","boeing-737-200F/");
			
			break;

	case 2: //Aircraft
                      	
			siteopt[0] = new Option("Select a Aircraft");
			siteopt[1] = new Option("Boeing 767-300ER","boeing-767-300-ER/");
			siteopt[2] = new Option("Boeing 737-200","boeing-737-200/");
			
siteopt[3] = new Option("AirBus 318","airbus-318/");
siteopt[4] = new Option("AirBus 319","airbus-319/");
			siteopt[5] = new Option("AirBus 320","airbus-a320/");
siteopt[6] = new Option("AirBus 340","airbus-a340/");

			//siteopt[5] = new Option("DC10 30F","DC10_30F/");
		//	siteopt[5] = new Option("Boeing 747-200","boeing-747-200/");
			break;

}

	for (i = 20; i > 0; i--){
	if(form.aircraft.options[i]){
		form.aircraft.options[i] = null;
			}
		}

	 tot = siteopt.length;

	for (i = 0; i < tot; i++){
		form.aircraft.options[i] = siteopt[i];
		}

	    form.aircraft.options[0].selected = true;
	    lst = tot;
	}