asp+ajax验证表单

<script   language="javascript">  
      
          function   createxmlhttprequest()   
          ...{   
                  var   xmlhttp=false;   
                  try   
                  ...{   
                          xmlhttp=new   ActiveXObject('Msxm12.XMLHTTP');   
                  }   
                  catch(e)   
                  ...{   
                          try   
                          ...{   
                                  xmlhttp=new   ActiveXObject('Microsoft.XMLHTTP');   
                          }   
                          catch(e)   
                          ...{   
                                  try   
                                  ...{   
                                          xmlhttp=new   XmlHttpRequest();   
                                  }   
                                  catch(e)   
                                  ...{   
                                  }   
                          }   
                    }   
                  return   xmlhttp;   
          }   



function view()
...{
  var str = document.getElementById( "name").value;
       checkuser(str);

}



          function   checkuser(checkstrs)
          ...{
                  var   xmlhttp=createxmlhttprequest();   
                  //var   checkstrs=document.getElementById('UserLogName');
                  xmlhttp.open('get','check.asp?groupnme='+escape(checkstrs)+'');   
                  xmlhttp.onreadystatechange=function()   
                  ...{
                          if(xmlhttp.readyState==4)   
                          ...{   
                                  if(xmlhttp.status==200)   
                                  ...{   
                                      if(xmlhttp.responseText=="0")  ...{
                                           document.getElementById("nameErr").innerText='不能使用; 
                                           document.getElementById("name").innerText=''; 
                                           var elem=document.all.name.createTextRange()
                                           elem.move("sentence")
                                           elem.select()
                                           return false;
                                      }else{
                                           document.getElementById("bianhaoErr").innerText='可以使用:'+xmlhttp.responseText; 

                                      } 

                                  }
                          }
                  }
                  xmlhttp.send(null);   
          }   

</Script>