文本框onblur事件一段代码错在哪了？

Question

<tr>  
                   <td  height="117"  valign="top"  bgcolor="#FFFFFF"  class="table">
                       <p>外造型：  
                           <input type="text" name="appearance"  id ="appearance" onblur="isInRange(this.name,this.value)"/>
                               <br>  
                               内部：                                  
                               <input type="text" name="designinside" onblur="isInRange(this.name,this.value)"/>
                                 
                               　<span > 分：100  最低分：0</span>  
                               <br>  
                       
                       </p>  
                       </td>  
               </tr>  
function  isNum(paraName,paraValue)  
{  
    var ccc=false;
   if  (isNaN(paraValue))  
   {  
    alert("必入一个数字");
    document.getElementById(paraName).focus();
   }else{
        ccc=true;
   }
   return  ccc;  
}  
function  isInRange(correspondingName,correspondingValue)  
{  
   alert(correspondingName);
   alert(correspondingValue);
   if  (  isNum(correspondingName,correspondingValue))  
   {  
   if  (  correspondingValue>100||correspondingValue<0  )  
   {  
   alert("入的数必在0~100之");      var bbb=document.getElementById(correspondingName).focus();    }  
}  }