function isEmail()
  {  
    var obj=document.getElementById("txtEmail");
    if(obj.value.length>0)
    {       
        
        var myReg = /^[-_A-Za-z0-9]+@([_A-Za-z0-9]+\.)+[A-Za-z0-9]{2,3}$/;  
        if(!myReg.test(obj.value))  
            return alert("邮箱格式不对!");  
        
    }
   
   } 
   function faxCheck(e)
   {
      var isIE = document.all?true:false;
      var key;
      if(isIE)
      {         
         key = window.event.keyCode;
      }
      else
      {
         key=e.which;        
      }
      if((key > 57 || key < 48)&& key != 45 && key != 8 && key != 12 && key!=127 )
            return false;
      else
            return true;
   }
   function onlyNumber(e)
   {
       var isIE = document.all?true:false;
      var key;
      if(isIE)
      {         
         key = window.event.keyCode;
      }
      else
      {
         key=e.which;        
      }
      if((key > 57 || key < 48)&& key != 8 && key != 12 && key!=127 )
            return false;
      else
            return true;
   }
   function mobileCheck()
   {
      if(document.getElementById('txtMobile').value.length >0)
      {
         var mobileReg =  /1[3|5]\d{9}$/;
         if(!mobileReg.test(document.getElementById('txtMobile').value))
         {
            //alert("手机格式不对!");
            document.getElementById('spErrMsg').innerText="手机格式不对";
            document.getElementById('spErrMsg').innerHTML="手机格式不对";
         }
         else
         {
            document.getElementById('spErrMsg').innerText="";
            document.getElementById('spErrMsg').innerHTML="";
         }
      }
        
   }