发一段Ajax的代码

AjAx.js
   var bCheckUserPass = false;
   var StrType;
   function checkUsers(StrTmp)
   {
    var oB = window.document.all.nam
    StrType=StrTmp
    if (oB.length == 0) return;
    /// 不允许玩家名中有英文逗号
    for (var i=0; i<oB.length; i++)
    {
     if (oB.value.length > 0)
     {
      if (!checkUserNameHasComma(oB.value))
      {
       alert("错误：玩家名字里面不能有英文逗号(半角逗号)！　　　\n玩家："+oB.value);
       return;
      }
     }
    }
    var sNames = "";
    for (var i=0; i<oB.length; i++)
    {
     if (oB.value.length > 0)
     {
      sNames += oB.value;
      sNames += ",";
     }
    }
    if (sNames.length > 0)
    {
     sUserNames = sNames.substr(0, sNames.length-1);
     getXml("checkuser");//window.setTimeout("getXml('checkuser')", 100);
    }
   }
   /// 不允许玩家名中有英文逗号
   function checkUserNameHasComma(sName)
   {
    if (sName == ""||sName == null) return false;
    var oRex = /,/g;
    if (sName.search(oRex) != -1) return false;
    return true;
   }
 //-----