function calculateVO2MAX()
{
	var t=0, distance, multiplier, flag=0;
	var d, c, i;

	var selectDist  = new Array(
	.9144,			//1 yard				//distances in meters
	1.0,			//1 meter
	402.336,		//1 lap
	1609.344,		//1 mile
	1000.0,			//1 Km
	5000.0, 		//5K
	10000.0, 		//10K
	21097.494, 		//1/2 Marathon
	42194.988		//Marathon
	);

	for(var j=0; j<5; j++)
	{
		if(isNaN(document.vo2maxForm.elements[j].value))
		{
			flag = 1;
		}
	}

	if(flag == 1) alert("Please enter numbers only - no text!");

	for(var j=0; j<3; j++)
	{
		t += (Math.pow(60, 1-j))*(document.vo2maxForm.hms[j].value);
	}

	distance = selectDist[document.vo2maxForm.distances.value];
	multiplier = document.vo2maxForm.mult.value;
	d=distance*multiplier;				//distance in meters
	c=-4.6+.182258*d/t+.000104*d*d/t/t;		//c(t) or Oxygen Cost
	i=.8+.1894393*Math.exp(-.012778*t)+		//i(t) or % VO2 Max
		.2989558*Math.exp(-.1932605*t);
	document.vo2maxForm.displayVO2MAX.value = Math.round(1000*c/i)/1000;
	document.tableForm.inputVO2MAX.value = Math.round(1000*c/i)/1000;
}

function calculateTable()
{
	var d, t, n, c, i, e, v, dc, di, dt, h, m, s;

	var displayDist = new Array(
	402.336, 		//1 lap					//distances in meters
	1609.344, 		//1 mile
	5000, 			//5K
	10000, 			//10K
	21097.494, 		//1/2 Marathon
	42194.988		//Marathon
	);

	v=document.tableForm.inputVO2MAX.value;
	if(isNaN(v))
	{
		alert("Please enter numerical values only. No text or blank spaces!");
	}

	for(var row=0; row<6; row++)					//for each distance in array
	{
		d=displayDist[row];					//distance in meters
		t=d*.004;						//start with a reasonable guess
		n=0;
		do							//start of iteration loop
		{
			c=-4.6+.182258*d/t+.000104*d*d/t/t;		//c(t) or Oxygen Cost
			i=.8+.1894393*Math.exp(-.012778*t)+		//i(t) or Intensity
				.2989558*Math.exp(-.1932605*t);
			e=Math.abs(c-i*v);				//distance between curves
			dc=-.182258*d/t/t-2*.000104*d*d/t/t/t;		//dc(t)/dt or slope of c(t) curve
			di=-.012778*.1894393*Math.exp(-.012778*t)-	//di(t)/dt or slope of i(t) curve
				.1932605*.2989558*Math.exp(-.1932605*t);
			dt=(c-i*v)/(dc-di*v);				//predicted correction
			t-=dt;						//new t value to try
			n++;						//times through loop
		}
		while(n<10 && e>.1);					//test for convergence

		h = Math.floor(t/60);					//whole hours
		m = Math.floor(t%60);					//whole minutes
		s = Math.round(60*(t-Math.floor(t)));			//nearest whole seconds

		document.tableForm.elements[3*row+2].value = h;
		document.tableForm.elements[3*row+3].value = m;
		document.tableForm.elements[3*row+4].value = s;
	}
}