//jQuery(document).ready(function(){
//    jQuery("#go").bind("onClick",function(){calculate(); return false;})
//});
function calculate(){
    var result_block = jQuery("#result_block");
    var result = jQuery("#exchange-convertor-result");
    var amount = jQuery("#exchange-convertor-amount").val();
    var from = jQuery("#exchange-convertor-from").val();
    var to = jQuery('#exchange-convertor-to').val();
    
    jQuery(result_block).hide('fast');
    
    var total = (amount*(from/to)).toFixed(2);
    jQuery(result).val(total);
    
    jQuery(result_block).show('slow');
}