function calc()
{
	var wt = document.bmi.wg.value;
	var ht = document.bmi.ht.value;
    
    
	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;
	
	
	
	//If value is not given for weight
	if(wt=="")
	{
		alert("Sila masukkan berat anda");
	}

	//If weight is less than 10
	else if(wt<=10)
	{
		document.bmi.si.value = 0;
	
		alert("Berat perlu melebihi 10kg");
	}
	
	//If weight is pounds and less than 22lbs
	else if(op=="pounds" && wt<=22)
	{
		document.bmi.si.value = 0;
	
		alert("Berat perlu lebih daripada 22lbs");
	}
	
	//If given height is less than 33cms
	else if(ht<33)
	{
		document.bmi.si.value = 0;
	
		alert("Tinggi perlu lebih daripada 33cm");
	}
	else if(op=="pounds")
	{
		document.bmi.si.value=Math.round((si/2.2)*100)/100;
	
	}
	var d = "Kategori anda: "
	if(si<15)
	{
	   
document.bmi.desc.value=  d + "Terlalu kurus.             Cuba Produk Gain Eight Ombak Besar di http://www.badanlangsing.com/kesihatan-umum/gain-eight-ombak-besar/prod_134.html";

         
         
	}
	else if(si>15 && si<=18.5)
	{
		document.bmi.desc.value= d + "Kurang Berat.              Cuba Produk Gain Eight Ombak Besar di http://www.badanlangsing.com/kesihatan-umum/gain-eight-ombak-besar/prod_134.html";
	    
	}
	else if(si>18.5 && si<=25)
	{	
		document.bmi.desc.value= d + "Normal.                    Cuba Produk DnHans di http://www.badanlangsing.com/kesihatan-umum/dnhans/prod_58.html";	
	
	}
	else if(si>25 && si<=30)
	{
		document.bmi.desc.value=d + "Melebihi Berat.             Cuba Perfect Body Slimming Suit di http://www.badanlangsing.com/pakaian/baju-langsing-nano-perfect-body/prod_2.html dan Produk S.I.Y Langsing dalam 10 hari http://www.badanlangsing.com/produk-pelangsingan/produk-langsing-siy-dalam-10-hari/prod_167.html";
	}
	else if(si>30)
	{
		document.bmi.desc.value=d + "Obes.                       Cuba Perfect Body Slimming Suit di http://www.badanlangsing.com/pakaian/baju-langsing-nano-perfect-body/prod_2.html dan Produk S.I.Y Langsing dalam 10 hari http://www.badanlangsing.com/produk-pelangsingan/produk-langsing-siy-dalam-10-hari/prod_167.html . Lebihkan senaman dan jaga pemakanan.";
	}
}


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);
	}

	else{
		ht = document.bmi.ht.value;
		if(ht!="")
		{
			var cm=Math.round(ht/2.54);
			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);
	}
}