take off blinking while dragging an image ??

How is the dragging being done?

Sorry. Dragging way is:

    public boolean mouseDrag(Event ev, int x, int y) {
      if(over == 1) { //over an image
         x = x - 8; //center image
         y = y - 6; //center image
          ima.setElementAt((new Integer(x)), (which+6));
          ima.setElementAt((new Integer(y)), (which+7));
        repaint();
      }

        for(int z=0; z<=((ima.size())-8); z=z+8) { //for1
         dy = Integer.valueOf(ima.elementAt(z+7).toString()).intValue();
         if(y>=dy & y<=(dy+12) & y!=dy & (ima.elementAt(z+2).toString()) != "I") {
          which2 = z;
          moveOver = 1;
         }
        } //for1
     
     
     return true;
    }

In 'if' loop I know that I already pressed over an image (over = 1 from mouseDown) and not over nothing.
'ima' is a Vector with images and the respective coordinates.
Do you think 'for' loop is the problem?. This 'for' loop is used in order to recognize over what image is dragging the image

No, I don't think so. I'm more concerned with the paint method. Could you post that as well? Have you overridden the update method (which clears the screen before paint is called (which will cause a flicker)?

You're right, I haven't used update method, where do I put it?.
Here's the paint method:

  public void paint(Graphics g) {
    g.drawImage(getImage(getDocumentBase(), "menutree/w_raiz.gif"), 12, 0, this);
    Font raizfuen = new Font("Courier", Font.PLAIN, 10);
    g.setFont(raizfuen);
    g.setColor(Color.blue);
    g.drawString("Root", 30, 11);
   
    g.drawImage(getImage(getDocumentBase(), "menutree/w_raiz.gif"), 65, 0, this);
    Font borrafuen = new Font("Courier", Font.PLAIN, 10);
    g.setFont(borrafuen);
    g.setColor(Color.red);
    g.drawString("Erase Element", 83, 11);
       
   for(int u=0; u<=((ima.size())-8); u=u+8) { //forqw
    if((ima.elementAt(u).toString()) == "F" &
       (ima.elementAt(u+1).toString()) == "C" &
       (ima.elementAt(u+2).toString()) == "V") { //iffc
      String nomfold = ima.elementAt(u+5).toString();
      g.drawImage(getImage(getDocumentBase(), "menutree/wcf.gif"),
      (Integer.valueOf(ima.elementAt(u + 6).toString()).intValue()),
      (Integer.valueOf(ima.elementAt(u + 7).toString()).intValue()), this);  
       Font fuente = new Font("Helvetica", Font.PLAIN, 10);
       g.setFont(fuente);      
       g.drawString(nomfold,
       ((Integer.valueOf(ima.elementAt(u + 6).toString()).intValue()) + 22),
       ((Integer.valueOf(ima.elementAt(u + 7).toString()).intValue()) + 10));    
    } //iffc

    if((ima.elementAt(u).toString()) == "F" &
       (ima.elementAt(u+1).toString()) == "A" &
       (ima.elementAt(u+2).toString()) == "V") { //iffa
      String nomfold = ima.elementAt(u+5).toString();
      g.drawImage(getImage(getDocumentBase(), "menutree/wof.gif"),
      (Integer.valueOf(ima.elementAt(u + 6).toString()).intValue()),
      (Integer.valueOf(ima.elementAt(u + 7).toString()).intValue()), this);  
       Font fuente = new Font("Helvetica", Font.PLAIN, 10);
       g.setFont(fuente);      
       g.drawString(nomfold,
       ((Integer.valueOf(ima.elementAt(u + 6).toString()).intValue()) + 22),
       ((Integer.valueOf(ima.elementAt(u + 7).toString()).intValue()) + 10));    
    } //iffa    
   
    if((ima.elementAt(u).toString()) == "B" &
       (ima.elementAt(u+2).toString()) == "V") { //aq
      String nomdoc = ima.elementAt(u+5).toString();
      g.drawImage(getImage(getDocumentBase(), "menutree/wdoc.gif"),
      (Integer.valueOf(ima.elementAt(u + 6).toString()).intValue()),
      (Integer.valueOf(ima.elementAt(u + 7).toString()).intValue()), this);  
       Font fuente = new Font("Helvetica", Font.PLAIN, 10);
       g.setFont(fuente);      
       g.drawString(nomdoc,
       ((Integer.valueOf(ima.elementAt(u + 6).toString()).intValue()) + 22),
       ((Integer.valueOf(ima.elementAt(u + 7).toString()).intValue()) + 10));
    } //aq
   
   } //forqw

    if(moveOver == 1 & (ima.elementAt(which2).toString()) == "B" &
       (ima.elementAt(which2+2).toString()) != "I") { //zx
      String nomdoc = ima.elementAt(which2+5).toString();
      g.drawImage(getImage(getDocumentBase(), "menutree/ddoc.gif"),
      (Integer.valueOf(ima.elementAt(which2 + 6).toString()).intValue()),
      (Integer.valueOf(ima.elementAt(which2 + 7).toString()).intValue()), this);  
       Font fuente = new Font("Helvetica", Font.PLAIN, 10);
       g.setFont(fuente);      
       g.drawString(nomdoc,
       ((Integer.valueOf(ima.elementAt(which2 + 6).toString()).intValue()) + 22),
       ((Integer.valueOf(ima.elementAt(which2 + 7).toString()).intValue()) + 10));
    } //zx

    if(moveOver == 1 & (ima.elementAt(which2).toString()) == "F" &
       (ima.elementAt(which2+1).toString()) == "C") { //zx1
      String nomdoc = ima.elementAt(which2+5).toString();
      g.drawImage(getImage(getDocumentBase(), "menutree/dcf.gif"),
      (Integer.valueOf(ima.elementAt(which2 + 6).toString()).intValue()),
      (Integer.valueOf(ima.elementAt(which2 + 7).toString()).intValue()), this);  
       Font fuente = new Font("Helvetica", Font.PLAIN, 10);
       g.setFont(fuente);      
       g.drawString(nomdoc,
       ((Integer.valueOf(ima.elementAt(which2 + 6).toString()).intValue()) + 22),
       ((Integer.valueOf(ima.elementAt(which2 + 7).toString()).intValue()) + 10));
    } //zx1

    if(moveOver == 1 & (ima.elementAt(which2).toString()) == "F" & 
       (ima.elementAt(which2+1).toString()) == "A") { //zx2
      String nomdoc = ima.elementAt(which2+5).toString();
      g.drawImage(getImage(getDocumentBase(), "menutree/dof.gif"),
      (Integer.valueOf(ima.elementAt(which2 + 6).toString()).intValue()),
      (Integer.valueOf(ima.elementAt(which2 + 7).toString()).intValue()), this);  
       Font fuente = new Font("Helvetica", Font.PLAIN, 10);
       g.setFont(fuente);      
       g.drawString(nomdoc,
       ((Integer.valueOf(ima.elementAt(which2 + 6).toString()).intValue()) + 22),
       ((Integer.valueOf(ima.elementAt(which2 + 7).toString()).intValue()) + 10));
    } //zx2
  }

Thanks.   :)