统一接口：为FireFox添加IE的方法和属性的js代码

    var parsedText=document.createTextNode(txtStr); 
    this.insertAdjacentElement(where,parsedText); 
    } 
  HTMLElement.prototype.attachEvent=function(sType,fHandler){ 
    var shortTypeName=sType.replace(/on/,""); 
    fHandler._ieEmuEventHandler=function(e){ 
      window.event=e; 
      return fHandler(); 
      } 
    this.addEventListener(shortTypeName,fHandler._ieEmuEventHandler,false); 
    } 
  HTMLElement.prototype.detachEvent=function(sType,fHandler){ 
    var shortTypeName=sType.replace(/on/,""); 
    if(typeof(fHandler._ieEmuEventHandler)=="function") 
      this.removeEventListener(shortTypeName,fHandler._ieEmuEventHandler,false); 
    else 
      this.removeEventListener(shortTypeName,fHandler,true); 
    } 
  }