how to delete node from somewhere middle in doubly linked list

[uytoor2]

it works fine to delete from start or end. but whenever I try to delete a value from middle , it gives garbage value :( plz help ...

  void dllist<T>::deletevalue2ndvalue(const T& el)    
  {
  	dlnode<T> *temp=head;
	if(head==0)  {
		cout<<"Error!  List is empty..."; return;
	}
	
	else if(head==tail) 
	{
		delete head;
		head=tail=0;  return;
	}
	else if(head->info==el)
	{
		this->deletefromfront();
		return;
	}
	else if(tail->info==el)
	{
		this->deletefromend();
		return;
	}
     while(head->info!=el && head->next!=0)
  	{head=head->next;
    }
  	if(head->info!=el)
  	{
	  	cout<<"ERROR! value not found"<<endl; return;
    }
  	  head->previous->next=head->next;
	  head->next->previous=head->previous;
	  delete head;
      head=temp;
  }

[uytoor2]

head->previous->next=head->next;
head->next->previous=head->previous;
delete head;

why doesn't this work?