function Calculate(){var tmpobjUnits=document.getElementById('selUnits');var fltUnits=tmpobjUnits.value;var tmpobjGender=document.getElementById('selGender');var fltGender=tmpobjGender.value;var tmpobjHeight=document.getElementById('txtHeight');var intHeight=tmpobjHeight.value*fltUnits;var tmpobjNeck=document.getElementById('txtNeck');var intNeck=tmpobjNeck.value*fltUnits;var tmpobjAbdomen=document.getElementById('txtWaist');var intAbdomen=tmpobjAbdomen.value*fltUnits;if(intHeight==''||isNaN(intHeight)||intHeight<1||intHeight>250){alert("Please enter your Height Measurment.");return false;}if(intNeck==''||isNaN(intNeck)||intNeck<1||intNeck>100){alert("Please enter your Neck Measurement.");return false;}if(intAbdomen==''||isNaN(intAbdomen)||intAbdomen<1||intAbdomen>250){alert("Please enter your Abdomen Measurement.");return false;}if(fltGender==0){var tmpobjHip=document.getElementById('txtHip');var intHip=tmpobjHip.value*fltUnits;if(intHip==''||isNaN(intHip)||intHip<1||intHip>250){alert("Please enter your Hip Measurement.");return false;}}var tmpobjdivBFP=document.getElementById('divBFP');var tmpobjspnBFP=document.getElementById('spnBFP');if(fltGender==0){var BodyFatPercent=495/(1.29579-0.35004*(Math.log(intAbdomen+intHip-intNeck)/Math.LN10)+0.22100*(Math.log(intHeight)/Math.LN10))-450;}else{var BodyFatPercent=495/(1.0324-0.19077*(Math.log(intAbdomen-intNeck)/Math.LN10)+0.15456*(Math.log(intHeight)/Math.LN10))-450;}tmpobjspnBFP.innerHTML=Math.round(BodyFatPercent*10)/10+'%';if(fltGender==0){if(BodyFatPercent>=10&&BodyFatPercent<13){tmpobjdivBFP.style.color='red';tmpobjdivBFP.innerHTML='Essential Fat';}if(BodyFatPercent>=14&&BodyFatPercent<21){tmpobjdivBFP.style.color='green';tmpobjdivBFP.innerHTML='Athletes';}if(BodyFatPercent>=21&&BodyFatPercent<25){tmpobjdivBFP.style.color='green';tmpobjdivBFP.innerHTML='Fitness';}if(BodyFatPercent>=25&&BodyFatPercent<32){tmpobjdivBFP.style.color='green';tmpobjdivBFP.innerHTML='Acceptable';}if(BodyFatPercent>=32){tmpobjdivBFP.style.color='red';tmpobjdivBFP.innerHTML='Obese';}}else{if(BodyFatPercent>=2&&BodyFatPercent<5){tmpobjdivBFP.style.color='red';tmpobjdivBFP.innerHTML='Essential Fat';}if(BodyFatPercent>=6&&BodyFatPercent<14){tmpobjdivBFP.style.color='green';tmpobjdivBFP.innerHTML='Athletes';}if(BodyFatPercent>=14&&BodyFatPercent<18){tmpobjdivBFP.style.color='green';tmpobjdivBFP.innerHTML='Fitness';}if(BodyFatPercent>=18&&BodyFatPercent<25){tmpobjdivBFP.style.color='green';tmpobjdivBFP.innerHTML='Acceptable';}if(BodyFatPercent>=25){tmpobjdivBFP.style.color='red';tmpobjdivBFP.innerHTML='Obese';}}}function selGenderChange(){var tmpobjGender=document.getElementById('selGender');var intGender=tmpobjGender.value;var tmpobjHip=document.getElementById('txtHip');if(intGender==0){tmpobjHip.disabled=false;tmpobjHip.style.backgroundColor='#ffffff';}else{tmpobjHip.disabled=true;tmpobjHip.style.backgroundColor='#f7f7f7';}}