JavaScript syntax issue I cannot resolve [closed]

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   function ActiveTab()
   {   
   var a= $find("ctl00_ContentPlaceHolder1_tcEmployee_ClientState").value;
    alert("First line开发者_StackOverflow中文版");
    var add=document.getElementById("ctl00_ContentPlaceHolder1_btnAddRecord");
        alert("after add");
     var update=document.getElementById("ctl00_ContentPlaceHolder1_btnUpdateRecord"); 
        alert("after update");
      var delet= document.getElementById("ctl00_ContentPlaceHolder1_DeleteRecord");
            alert("after del");
        if(a == 0)
        { 
                alert("if 0");  
            add.WebForm_PostBackOptions = "Insertion";
            update.WebForm_PostBackOptions = "Insertion";
            delet.WebForm_PostBackOptions = "Insertion";
        } 
        else if(a == 1)
        {
            alert("if 1");
            add.WebForm_PostBackOptions = "Insertion1";
            update.WebForm_PostBackOptions = "Insertion1";
            delet.WebForm_PostBackOptions = "Insertion1"; 
        }
        else  
        {
                alert("else");
            add.WebForm_PostBackOptions = "Insertion2";
            update.WebForm_PostBackOptions = "Insertion2";
            delet.WebForm_PostBackOptions= "Insertion2";   
        }  
  }

What is problem with my code I receive } and ; missing error. What is wrong with my code?

---

should be getElementById:

var add = document.setElementById("ctl00_ContentPlaceHolder1_btnAddRecord");

and missing =:

var delet document.getElementById("ctl00_ContentPlaceHolder1_DeleteRecord");