function calc(thisform){
  var ntall ;
  var ntekubi ;
    
  with(thisform) {
    if ( isNaN(tall.value)  || (tall.value.length == 0) ) {
      alert("正しい数値を入力してください！");
      return ;
    }
    
    ntall = eval(tall.value);
   
    kg.value = Math.round((ntall - 100)* 0.81* 10)/ 10 ;
    b.value = Math.round(ntall * 0.52* 10)/ 10 ;
    w.value = Math.round(ntall * 0.37* 10)/ 10 ;
    uw.value = Math.round(ntall * 0.46* 10)/ 10 ;
    h.value = Math.round(ntall * 0.53* 10)/ 10 ;  
   // arm.value = Math.round(ntall * 0.15 * 10)/ 10 ;
    th.value = Math.round(ntall * 0.29 * 10)/ 10 ; 
    calf.value = Math.round(ntall * 0.2 * 10)/ 10 ; 
    ankle.value = Math.round(ntall * 0.116 * 10)/ 10 ;
  }   
}