// city arrays
destinationvegas = new Array(2);
destinationvegas[0] = "Anaheim";
destinationvegas[1] = "Los Angeles";


	vegasabbreviation = new Array(2);
    vegasabbreviation[0] = "anaheim";
    vegasabbreviation[1] = "losangeles";

              
destinationdiego = new Array(2);           
destinationdiego[0] = "Anaheim";
destinationdiego[1] = "Los Angeles";


	diegoabbreviation = new Array(2);           
	diegoabbreviation[0] = "anaheim";
	diegoabbreviation[1] = "losangeles";


destinationlos = new Array(3);           
destinationlos[0] = "Anaheim";
destinationlos[1] = "San Diego";
destinationlos[2] = "Las Vegas";


	losabbreviation = new Array(3);           
	losabbreviation[0] = "anaheim";
	losabbreviation[1] = "sandiego";	
	losabbreviation[2] = "lasvegas";	
	

destinationana = new Array(3);           
destinationana[0] = "Los Angeles";
destinationana[1] = "San Diego";
destinationana[2] = "Las Vegas";


	anaabbreviation = new Array(3);           
	anaabbreviation[0] = "losangeles";
	anaabbreviation[1] = "sandiego";	
	anaabbreviation[2] = "lasvegas";	
	



function activateChange() {
  if (document.menu.origin.value.toLowerCase()=="lasvegas" || document.menu.origin.value.toLowerCase()=="sandiego" || document.menu.origin.value.toLowerCase()=="losangeles" || document.menu.origin.value.toLowerCase()=="anaheim") 
  {
    document.menu.destination.disabled=false;
	updateState();
  }
  else {
    document.menu.destination.disabled=true;
  }
}

function updateState() {
	document.menu.destination.length=0;
    var place = (document.menu.origin.value);
    document.menu.destination.options[0] = new Option("Where?");
    document.menu.destination.options[0].value = "";
    if ( place.toLowerCase()=="lasvegas" )
    {
        for( var i = 0; i < destinationvegas.length; i++)
        {
            document.menu.destination.options[i+1]= new Option(destinationvegas[i]);
            document.menu.destination.options[i+1].value = vegasabbreviation[i];
        }
    }
	else if ( place.toLowerCase()=="sandiego" ) {
		for( var i = 0; i < destinationdiego.length; i++)
        {
            document.menu.destination.options[i+1]= new Option(destinationdiego[i]);
            document.menu.destination.options[i+1].value = diegoabbreviation[i];
        }
	}
	else if ( place.toLowerCase()=="losangeles" ) {
		for( var i = 0; i < destinationlos.length; i++)
        {
            document.menu.destination.options[i+1]= new Option(destinationlos[i]);
            document.menu.destination.options[i+1].value = losabbreviation[i];
        }
	}
	else if ( place.toLowerCase()=="anaheim" ) {
		for( var i = 0; i < destinationana.length; i++)
        {
            document.menu.destination.options[i+1]= new Option(destinationana[i]);
            document.menu.destination.options[i+1].value = anaabbreviation[i];
        }
	}
}