/*function calculate_bmi()
{

	var height_cent		=	document.getElementById('height_cent').value;
	var height_feet		=	document.getElementById('height_feet').value;
	var height_inches	=	document.getElementById('height_inches').value;
	var weight_kg		=	document.getElementById('weight_kg').value;
	var weight_stone	=	document.getElementById('weight_stone').value;
	var weight_pounds	=	document.getElementById('weight_pounds').value;
	
	if(isWhitespace(height_cent)&&isWhitespace(height_feet)&&isWhitespace(height_inches))
	{
		alert('Please enter only one measurement for height.');
		document.getElementById('height_cent').focus();
		return false;
		
	}
	else if((!isWhitespace(height_cent)&&!isWhitespace(height_feet))||(!isWhitespace(height_cent)&&!isWhitespace(height_inches)))
	{
		alert('Please enter height in either centimeters or inches.');
		return false;
		
	}
	else if(isWhitespace(weight_kg)&&isWhitespace(weight_stone)&&isWhitespace(weight_pounds))
	{
		alert('Please enter only one measurement for weight.');
		return false;
		
	}
	else if((!isWhitespace(weight_kg)&&!isWhitespace(weight_stone))||(!isWhitespace(weight_kg)&&!isWhitespace(weight_pounds)))
	{
		alert('Please enter weight in either kilograms or pounds.');
		return false;
		
	}
}*/
function DoActive(tabstring)
	{
		var de_act = document.getElementById('active_tab').value;
		document.getElementById('what_glucomax').style.display = "none";
		document.getElementById(de_act).className = "inactive_carb";
		document.getElementById(de_act+"_1").style.display = "none";
		document.getElementById(de_act+"_2").style.display = "block";
		document.getElementById(de_act+"_cont").style.display = "none";
		document.getElementById(tabstring).className = "active_carb";
		document.getElementById(tabstring+"_1").style.display = "block";
		document.getElementById(tabstring+"_2").style.display = "none";
		document.getElementById(tabstring+"_cont").style.display = "block";
		document.getElementById('active_tab').value = tabstring;
	}
function calculate_bmi()
{
	/*var cnt	;
	var height_cent		=	document.getElementById('height_cent'+cnt).value;
	var height_feet		=	document.getElementById('height_feet'+cnt).value;
	var height_inches	=	document.getElementById('height_inches'+cnt).value;
	var weight_kg		=	document.getElementById('weight_kg'+cnt).value;
	var weight_stone	=	document.getElementById('weight_stone'+cnt).value;
	var weight_pounds	=	document.getElementById('weight_pounds'+cnt).value;*/
	
	var height_cent		=	document.getElementById('height_cent').value;
	var height_feet		=	document.getElementById('height_feet').value;
	var height_inches	=	document.getElementById('height_inches').value;
	var weight_kg		=	document.getElementById('weight_kg').value;
	var weight_stone	=	document.getElementById('weight_stone').value;
	var weight_pounds	=	document.getElementById('weight_pounds').value;
	
	
	if(isWhitespace(height_cent)&&isWhitespace(height_feet)&&isWhitespace(height_inches))
	{
		alert('Please enter only one measurement for height.');
		document.getElementById('height_cent').focus();
		return false;
		
	}
	else if((!isWhitespace(height_cent)&&!isWhitespace(height_feet))||(!isWhitespace(height_cent)&&!isWhitespace(height_inches)))
	{
		alert('Please enter height in either centimeters or inches.');
		return false;
		
	}
	else if(isWhitespace(weight_kg)&&isWhitespace(weight_stone)&&isWhitespace(weight_pounds))
	{
		alert('Please enter only one measurement for weight.');
		return false;
		
	}
	else if((!isWhitespace(weight_kg)&&!isWhitespace(weight_stone))||(!isWhitespace(weight_kg)&&!isWhitespace(weight_pounds)))
	{
		alert('Please enter weight in either kilograms or pounds.');
		return false;
		
	}
	
	if(height_cent>0)
	{
		var height_cent_meter =	height_cent / 100; // Convert from centimeters to meters
	}
	else
	{
		if(height_feet>0)
		{
			var ht_feet_meter	=	height_feet*0.3048; // Convert from feet to meters
		}
		else
		{
			var  ht_feet_meter =0;
		}
		
		if(height_inches>0)
		{	
			var ht_in_meter	=	height_inches*0.0254; // Convert from inches to meters
		}	
		else
		{
			var ht_in_meter=0;	
		}
		
		var  height_cent_meter	=	ht_feet_meter+	ht_in_meter;
	}	
	
	
	if(weight_kg>0)
	{
		var  weight_kilo	=	weight_kg;
	}
	else
	{
		if(weight_pounds>0)
		{
			var  weight_p_kilo	= weight_pounds * 0.45359237; // Convert from pounds to kilos
		}
		else
		{
			var  weight_p_kilo	=0;	
		}
				
		if(weight_stone>0)
		{	
			var  weight_s_kilo	= weight_stone*6.35029318; // Convert from stone to kilos
		}	
		else
		{
			var  weight_s_kilo	=0;
		}
		
		var weight_kilo	=	weight_p_kilo+weight_s_kilo;
	}	
					
   var  bmi = roundNumber(weight_kilo / (height_cent_meter * height_cent_meter),2);
	if(bmi>27)
	{
		document.getElementById('disp_p').style.display='';
		//document.getElementById('show_session').style.display='none';
		document.getElementById('disp_p').innerHTML ='<strong><br>Your BMI is '+bmi+'. As your BMI is over 27, you can proceed to purchase Biocarb.</strong>';
		
		
	}
	else
	{
		document.getElementById('disp_p').style.display='';
		//document.getElementById('show_session'+cnt).style.display='none';
		var bmi_id='bmi_calc'+bmi;
		document.getElementById('disp_p').innerHTML ="<strong><br>Your BMI is "+bmi+".  This is usually considered underweight. Biocarb is not suitable for use if your BMI is under 28. To re-enter your weight";	
	}
	
	
	
}

var whitespace = " \t\n\r";

function isEmpty(s) {
    return ((s == null) || (s.length == 0))
}
function isWhitespace(s) {
    var i;
    if (isEmpty(s)) return true;
    for (i = 0; i < s.length; i++) {
        var c = s.charAt(i);
        if (whitespace.indexOf(c) == -1) return false
    }
    return true
}