code: function _indexOf(a,s){
  	// Do we need the hack?
  	if(a.indexOf){
  		return a.indexOf(s);
  	}
  
  	for(var j=0;j<a.length;j++){
  		if(a[j]===s){
  			return j;
  		}
  	}
  	return -1;
  }
docs: indexOf IE hack Array.indexOf doesn't exist prior to IE9