<!--

/* 标准体重计算减肥专题 */

//-->
var imagenumber = 3 ;
var randomnumber = Math.random() ;
var rand = Math.round( (imagenumber-1) * randomnumber) + 1 ;
urls = new Array;
images = new Array;
alts = new Array;
var url = urls[rand];
var image = images[rand];
var alt = alts[rand];
function lookme(form) {
var bmi;
  if(! checkform(form)) return false;
  comput(form);
  bmi = Math.round(form.weight.value*10000/eval(form.height.value*form.height.value));
  form.bmi.value= bmi;
  if (bmi >36) {
     form.nowstat.value="啊,你太、太...太胖了,快点使用廋廋减肥套餐减减肥吧！";
  }else if (bmi >32) {
     form.nowstat.value="哇！你好胖啊!必须开始减肥了,听我的没错";
  }else if (bmi >27) {
     form.nowstat.value="哎呀！你可是比较胖胖啊，赶快开始减肥计划吧！";
  }else if (bmi >24) {
     form.nowstat.value="小心喔!胖胖!还要多多运动啊!:)";
 }else if (bmi >20) {
     form.nowstat.value="小心喔!稍胖!还要多多运动啊!:)";
  }else if (bmi >=18) {
     form.nowstat.value="我好羡慕你啊,你这可是魔鬼身材啊!! :))";
  }else if (bmi >=16) {
     form.nowstat.value="你一定是受到了虐待，快点大量吃东西吧!";
  }else {
     form.nowstat.value="哇塞!一点肉都没有,快找大夫看看吧!!";
  }
  return true;
}
function comput(form) {
  if(document.getElementById("sex01").checked==true)
    form.legendweight.value = Math.round(50+(2.3*(form.height.value-152))/2.54);
  else
    form.legendweight.value = Math.round(45.5+(2.3*(form.height.value-152))/2.54);
}
<!-- hide this script tag's contents from old browsers
function ClearForm(form){
form.weight.value = "";
form.height.value = "";
form.bmi.value = "";
form.my_comment.value = "";
}
function bmi(weight, height) {
bmindx=weight/eval(height*height);
return bmindx;
}
function checkform(form) {

if (document.getElementById("sex01").checked==false && document.getElementById("sex02").checked==false ){
alert("\你还没选择性别^o^");
 return false;
 }
if (form.weight.value==null||form.weight.value.length==0
|| form.height.value==null||form.height.value.length==0){
alert("\电脑不是万能的，没数据怎么测试啊^o^");
 return false;
 }
else if (parseFloat(form.height.value) <= 0||
parseFloat(form.height.value) >=250||
parseFloat(form.weight.value) <= 0||
parseFloat(form.weight.value) >=250){
alert("\你弄错了吧？怎么回事啊？？ \n快改正一下，再测试一遍……");
ClearForm(form);
 return false;
 }
 return true;
}

 // -- done hiding from old browsers -->

						<!-- article end -->