$(function(){
$("#submit").click(function(){
	$(".result").html("<img src='ajax-loader.gif' />");
    $("#submit").attr("disabled", "true");
	$.ajax({
	   type: "POST",
	   url: "ajax.sample.php",
	   data: "FromCurrency="+$("#FromCurrency").val()+"&ToCurrency="+$("#ToCurrency").val()+"&amount="+$("#amount").val(),
	   success: function(html){
   			$(".result").html(html);
            $("#submit").attr("disabled", "");
	   }
	 });
	
});
});