function IsNumeric(sText)
{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

   for (i = 0; i < sText.length && IsNumber == true; i++)
   {
	   Char = sText.charAt(i);
	   if (ValidChars.indexOf(Char) == -1)
	   {
		   IsNumber = false;
	   }
   }
   return IsNumber;
}

function calc()
{
	var distance = $j('#Distance').val();
	if (distance == '' || (!IsNumeric(distance)))
	{
		$j("#msg").html("<b>Invalid Weight</b>");
		return;
	}
	var data = "sex="+ $j('#Sex').val();
	data += "&sdistance="+ $j('#Distance').val();
	data += "&stest="+ $j('#Test').val();
	data += "&sdistanceunit="+ $j('#DistanceUnit').val();
	data += "&sage="+ $j('#Age').val();
	
	$j("#msg").html('');	
	
	$j.ajax({
		type: "post",
		url: "/tools/12min_run/minuterun.php",
		data: data,
		dataType: "json",
		success: function(data) {
			$j('#min_run_details .results').show();
			$j("#mets").html(data.METs +'*');
			$j("#v0max").html(data.VOMax +'**');
			$j("#pop_avg").html(data.PopulationAverage);
			$j("#score").html(data.Score);
			$j("#rating").html(data.Rating);
		},
		error: function() {
		}
	});
}