在javascript中无法在IE中运行的函数调用

Question

need your help again... for javascript :) see below the code..

           var x=input;
            var atpos=x.indexOf("@");
            var dotpos=x.lastIndexOf(".");
            if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length)
                 {
                    username=input;
                    check_username.call();
                 }
             else
                 {
                     email=input;
                     check_email.call();
                 }

and the actual function goes below... (just a sample start of the pgm)

 function check_username()  
      {
          if (username!="")
          {
              var xmlhttp;    
              {
                if (window.XMLHttpRequest)

the call to the function works well with Chrome and Firefox. But doesn't get triggered with IE 8 :( i get the error message - object expected... can you please share me the code i need to use - for calling function. thanks again! :)

Answer 1

check_username.call(this);

和

check_email.call(this);