raz=Array('a','b','c','d','e','f','g');
 imag=Array('home.jpg','sear.jpg','sell.jpg','deal.jpg','acc.jpg','cont.jpg','nada.jpg');
 dwa=Array('a_i','b_i','c_i','d_i','e_i','f_i','g_i');
 imag_i=Array('home_i.jpg','sear_i.jpg','sell_i.jpg','deal_i.jpg','acc_i.jpg','cont_i.jpg','nada_i.jpg');

 for(i=0;i<raz.length;i++)
       raz[i]=new Image;
  for(i=0;i<raz.length;i++)
   {

          raz[i].src="./images/"+imag[i];
   }

   for(i=0;i<dwa.length;i++)
       dwa[i]=new Image;
  for(i=0;i<dwa.length;i++)
   {

          dwa[i].src="./images/"+imag_i[i];
   }

   function alter(par,nm)
   {

        switch(par)
        {
                   case 1: document.images[nm+3].src=dwa[nm].src;break;
                   case 2: document.images[nm+3].src=raz[nm].src;break;

        }

   }