function calc()
{
	var wt = document.bmi.wg.value;
	var ht = document.bmi.ht.value;
	var pop = document.bmi.pop.value;
	//alert(pop);
	var op=document.bmi.opt1.value;
	
	//SI value
	var h = ht/100;
	var si = Math.round((wt/(h*h))*100)/100;
	document.bmi.si.value = si;
	
	//US value
	//var lb = wt*2.2;
	//var ic = ht*0.39;
	//var us = Math.round((703*(lb/(ic * ic)))*100)/100;
	//document.bmi.us.value = us;
	
	//UK value
	//var uk = Math.round((6.35*si)*100)/100;
	//document.bmi.uk.value = uk;
	
	//If value is not given for weight
	if(wt=="")
	{
		alert("Enter the value for weight");
	}
	
	//If weight is less than 10
	else if(wt<=10)
	{
		document.bmi.si.value = 0;
		//document.bmi.us.value = 0;
		//document.bmi.uk.value = 0;
		alert("Weight should be greater than 10kgs");
	}
	
	//If weight is pounds and less than 22lbs
	else if(op=="pounds" && wt<=22)
	{
		document.bmi.si.value = 0;
		//document.bmi.us.value = 0;
		//document.bmi.uk.value = 0;
		alert("Weight should be greater than 22lbs");
	}
	
	//If given height is less than 33cms
	else if(ht<33)
	{
		document.bmi.si.value = 0;
		//document.bmi.us.value = 0;
		//document.bmi.uk.value = 0;
		alert("Height should be taller than 33cms");
	}
	else if(op=="pounds")
	{
		document.bmi.si.value=Math.round((si/2.2)*100)/100;
		//document.bmi.us.value=Math.round((us/2.2)*100)/100;
		//document.bmi.uk.value=Math.round((uk/2.2)*100)/100;
	}
	//var d = "Your category is "
	var d = "";
	if(pop == "Asian Indian")
	{
		if(si<18.5)
		{
			document.bmi.desc.value= d + "Your BMI is " + si + " indicating your weight is in the underweight category for adults of your height. Being underweight may weaken your immune system and put you at greater risk for nutritional deficiency diseases and osteoporosis. To achieve healthy weight, embrace healthy eating by choosing a variety of calorie and nutrient rich foods and strength training exercises to promote lean muscle development.";
			document.bmi.desc.style.color='#ff0000';
		}
		else if(si>18.5 && si<=22.9)
		{
			document.bmi.desc.value= d + "Congratulations, you are in the Normal category! Your healthy weight is well worth the effort. It reduces your risk of developing serious health conditions such as high Blood Pressure, heart disease, stroke and diabetes. To stay within this range, maintain healthy habits such as eating a balanced diet and engaging in regular exercise";
			document.bmi.desc.style.color='#479300';
		}
		else if(si>23 && si<=24.9)
		{	
			document.bmi.desc.value= d + "Your BMI is " + si + " indicating your weight is in the overweight category for adults of your height. Being overweight increases the risk of health problems such as high BP, high blood cholesterol, heart disease and diabetes and weight loss may help lower the risk of disease";
			document.bmi.desc.style.color='#ff0000';
		}
		else if(si>25)
        {
			document.bmi.desc.value=d + "Your BMI is " + si + " indicating your weight is in the obese category for adults of your height. Consider the benefits of achieving a healthy weight – a reduced risk of health conditions such as high blood pressure, diabetes and heart disease with improved lifestyle and self esteem.";
			document.bmi.desc.style.color='#ff0000';
        }
	}
	else
	{
		if(si<18.5)
		{
			document.bmi.desc.value= d + "Your BMI is " + si + " indicating your weight is in the underweight category for adults of your height. Being underweight may weaken your immune system and put you at greater risk for nutritional deficiency diseases and osteoporosis. To achieve healthy weight, embrace healthy eating by choosing a variety of calorie and nutrient rich foods and strength training exercises to promote lean muscle development.";
			document.bmi.desc.style.color='#ff0000';
		}
		else if(si>18.5 && si<=24.9)
		{
			document.bmi.desc.value= d + "Congratulations, you are in the Normal category! Your healthy weight is well worth the effort. It reduces your risk of developing serious health conditions such as high Blood Pressure, heart disease, stroke and diabetes. To stay within this range, maintain healthy habits such as eating a balanced diet and engaging in regular exercise";
			document.bmi.desc.style.color='#479300';
		}
		else if(si>25 && si<=29.9)
		{	
			document.bmi.desc.value= d + "Your BMI is " + si + " indicating your weight is in the overweight category for adults of your height. Being overweight increases the risk of health problems such as high BP, high blood cholesterol, heart disease and diabetes and weight loss may help lower the risk of disease";
			document.bmi.desc.style.color='#ff0000';
		}
		else if(si>30)
        {
			document.bmi.desc.value=d + "Your BMI is " + si + " indicating your weight is in the obese category for adults of your height. Consider the benefits of achieving a healthy weight – a reduced risk of health conditions such as high blood pressure, diabetes and heart disease with improved lifestyle and self esteem.";
			document.bmi.desc.style.color='#ff0000';
        }
	}
}


function conv(aa)//Height conversion
{
	var ft=0, inc=0, ht=0;
	if(aa==1 || aa==2)
	{
		ft = document.bmi.opt2.value;
		inc = document.bmi.opt3.value;
		var ss = ft*12;
		var tot = ss+parseInt(inc);
       	var val= tot*2.54;
		//document.bmi.ht.value = Math.round(val);
		document.bmi.ht.value = val.toFixed(2);
	}

	else{
		ht = document.bmi.ht.value;
		if(ht!="")
		{
			//var cm=Math.round(ht/2.54);
			var cm=ht/2.54;
			var cm=cm.toFixed(2);;
			var div=parseInt(cm/12);
			var md=cm%12;
			document.bmi.opt2.value=div;
			document.bmi.opt3.value=md;
		}
         }

}


function unit()  //Weight conversion
{
	var pp=document.bmi.opt1.value;
	var ww = document.bmi.wg.value;
	
	//Kilogram to pounds
	if(pp=="pounds")	
	{
		document.bmi.wg.value = Math.round((ww*2.2)*100)/100;
	}

	//Pounds to kilograms
	else
	{
		document.bmi.wg.value=Math.round(ww/2.2);
	}
}