//firefox支持innerText解决方法
function isIE(){ //ie?
   if (window.navigator.userAgent.toLowerCase().indexOf("msie")>=1)
    return true;
   else
    return false;
}

if(!isIE()){ //firefox innerText define
   HTMLElement.prototype.__defineGetter__(     "innerText",
    function(){
     var anyString = "";
     var childS = this.childNodes;
     for(var i=0; i<childS.length; i++) {
      if(childS[i].nodeType==1)
       anyString += childS[i].tagName=="BR" ? '\n' : childS[i].innerText;
      else if(childS[i].nodeType==3)
       anyString += childS[i].nodeValue;
     }
     return anyString;
    }
   );
   HTMLElement.prototype.__defineSetter__(     "innerText",
    function(sText){
     this.textContent=sText;
    }
   );
}