jQuery(document).ready(function()
{
	jQuery("#exchange_sum").keypress(function (e) {

	  if (e.which == 13) {
        jQuery("#calculate").click();
        return false;
	  }

	  //if the letter is not digit then display error and don't type anything
	  if( e.which!=8 && e.which!=0 && (e.which<48 || e.which>57) ) {
          // for coma
          if (e.which == 44 || e.which == 46) {
              var hasDot = e.target.value.indexOf('.');

              if (hasDot == -1) {
                  e.target.value = e.target.value + '.';
              }
          }

          return false;
	  }

	});
	
  jQuery('#form input[type="submit"]').hide();
  jQuery("#calculate").click(function(e)
  { 
  	 var sum = jQuery("#exchange_sum").val();
		 var valute = jQuery("#exchange_valute").val();
		 var operation = jQuery(":radio:checked[@name='radio_group']").val();
     
		jQuery('#exchange_results').load('content/exchangeCalculate', {calculate_sum: sum, calculate_valute: valute, calculate_operation: operation});
	  jQuery('#loader').show();
		jQuery('#exchange_results').show();
		jQuery('#loader').hide();
		return false;
    });
});