function getChildren(obj){
 var objChild = [] ;
 var objs = obj.getElementsByTagName('*');
 for(var i=0,j=objs.length; i<j;++i){
  if(objs[i].nodeType != 1){alert(objs[i].nodeType);
   continue ;
  }
  var temp = objs[i].parentNode;
  if(temp.nodeType == 1){
   if(temp == obj){
    objChild[objChild.length] = objs[i] ;
   }
  }else if(temp.parentNode == obj){
   objChild[objChild.length] = objs[i] ;
  }
 }
 return objChild ;
}