function calc()
{
            var ft=0, inc=0, ht=0;
            ft = document.bmi.opt2.value;
            inc = document.bmi.opt3.value;
            var ss = ft*12;
            var tot = ss+parseInt(inc);
            var ht = Math.round(tot);


            var wt = document.bmi.wg.value;
            
            var op=document.bmi.opt1.value;
            
            var bmi = 0;
            var h = 0;
            var w = 0;
            var lwl = 0;
            var uwl = 0;
            
            if(op=="pounds")
            {
                        h = ht;
                        w = wt;
            }
            else
            {
                        h = ht*0.39;
                        w = wt*2.205;
            }
            
            //calculate bmi
            bmi = Math.round(((w*703)/(h*h))*100)/100
            
            if(op=="pounds")
            {
                        lwl = Math.round((18.5*(h*h)*100)/703)/100;
                        uwl = Math.round((24.9*(h*h)*100)/703)/100;
            }
            else
            {
                        lwl = Math.round(((18.5*(h*h)*100)/703)*0.453)/100;
                        uwl = Math.round(((24.9*(h*h)*100)/703)*0.453)/100;
            }


            //SI value
            //var h = ht/100;
            //var si = Math.round((wt/(h*h))*100)/100;
            //document.bmi.si.value = si;
            document.bmi.si.value = bmi;
            
            //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 = bmi;
            
            //UK value
            //var uk = Math.round((6.35*si)*100)/100;
            document.bmi.uk.value = bmi;
            
            //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/2.205)*100)/100;
                        //document.bmi.us.value=Math.round((us/2.205)*100)/100;
                        //document.bmi.uk.value=Math.round((uk/2.205)*100)/100;
                        document.bmi.uk.value=bmi;             
                        document.bmi.uk.value=bmi;             
                        document.bmi.uk.value=bmi;             
            }
            var d = " "
            if(bmi<15)
            {
                        document.bmi.desc.value= d + "Go Gain Weight!";
            }
            else if(bmi>15 && bmi<=18.5)
            {
                        document.bmi.desc.value= d + "You Are Normal";
            }
            else if(bmi>18.5 && bmi<=25)
            {          
                        document.bmi.desc.value= d + "2 Week Program";   
            }
            else if(bmi>25 && bmi<=30)
            {
                        document.bmi.desc.value=d + "3 Week Program";
            }
            else if(bmi>30)
            {
                        document.bmi.desc.value=d + "4 Week Program";
            }
}


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*2.205)*100)/100;
            }

            //Pounds to kilograms
            else
            {
                        document.bmi.wg.value=Math.round(ww/2.205);
            }
}