// JavaScript Document
$(document).ready(function()	{
		$("div#tool form input[type='submit']").click(calcIt);
	});
	
	function calcIt(e)	{
		e.preventDefault();
		depth = $("div#tool form input[type='text']").attr("value");
		$("p.error").remove();
		$("div#tool p").css("display", "none");
		if(isUnsignedInteger(depth) && depth <= 20000)	{
			$("div#tool p strong").load('getCost.php?js=1&nipple_depth=' + depth, function()	{
																						   $("div#tool p").css("display", "block");
																						   });						
		} else	{
			$("div#tool").append('<p class="error">Please enter a positive integer between 1 and 20000.</p>');
			$("div#tool p.error").css("display", "block");
		}		
	}
	
	function isUnsignedInteger(s) {
		return (s.toString().search(/^[0-9]+$/) == 0);
	}