function getID()
{
var ID=document.getElementById("ID");
 {for(var i=0;i<ID.length;i++)

   if(ID.options[i].selected)
   { 
   return ID.options[i].value;
   }
 }
}


function hasDianti()
{
var dianTi=document.getElementById("dianTi");
   for(var i=0;i<dianTi.length;i++)
   {
     if(dianTi[i].checked)
     return dianTi[i].value ;
   }
}

function getPrice()
{
 var a ;
 var price=document.getElementById("price");
 for(var i=0;i<price.length;i++)
 {
    if(price.options[i].selected) 
    {
      a = price.options[i].value ;
      return a;
    }
 } 
}
function check()
{
  var emsg = "";
  var mianJi = document.getElementById("mianJi").value;//document.Form1.mianJi.value;
  if(mianJi=="")
  { 
    emsg="请输入房屋面积!\n";
  }
  else//数据合法性校验
  {
     var patrn=/^\d{1,20}.{0,1}\d{0,2}$/;
     if (!patrn.exec(mianJi)) 
     {
      emsg="请输入数字";
     }
  }
 return emsg;
}

//计算并显示
function cal()
{ 
  var result = document.getElementById("Result");// .Form1.Result;
  var emsg = check();
  if(emsg!="")
  { 
   alert(emsg) ;
   return false ;
  }
  var Tax ;
  var mianJix = document.getElementById("mianJi");//document.Form1.mianJi.value;
  var mianJi=mianJix.value;
  mianJi = parseFloat(mianJi);
  var i = (hasDianti()=="1");
  var price = getPrice();
  price = parseInt(price); 
  var j=getID();
  //是业主还是开发建设单位
  if(i)//有电梯
  {
      switch (j)
     {
      case "购房人":
      Tax=mianJi*price*0.025;
      result.value=Tax;
      break;
      case "开发建设单位":
      Tax=(mianJi*price*3.5)/100;
	   //Tax=mianJi*price*0.035;
	   //出现奇怪的小数位！
      result.value=Tax;
      break;
     }
  }
  else//没有电梯
  {
      switch (j)
     {
      case "购房人":
      Tax=mianJi*price*0.02;
      result.value=Tax;
      break;
      case "开发建设单位":
      Tax=(mianJi*price*3)/100;
	  //Tax=mianJi*price*0.03;
	  //出现奇怪的小数位！
      result.value=Tax;
      break;
     }
  }
}