// Для фотогалереи-2: photogallery2.php
var p_i = 1;
 
function go_forward(a,n)
  {
   amax = a.length;
   if (p_i<=amax)
    {a_index = p_i; 
	 p_i++; 
	 pic_name = "../pictures"+a[a_index];
	 document.all['big_photo'].src=pic_name;
	 
	 var imageDescription = n[a_index];  
	 document.getElementById('image-desc').innerHTML = imageDescription; 
	 
	 document.all['ar_left'].src="images/ar_left.gif";
	}; 
	if (p_i>=amax)
	  { document.all['ar_right'].src="images/none.gif";
	    p_i = amax;
	  }
	 else
	  { document.all['ar_right'].src="images/ar_right.gif";
	  };
	document.all['right_a'].blur();
  };

 
function go_backward(a,n)
  {
   amax = a.length;
   if (p_i>1)
    { p_i--; 
	 a_index = p_i-1;
	 pic_name = "../pictures"+a[a_index];
	 document.all['big_photo'].src=pic_name;
	 
	 var imageDescription = n[a_index];  
	 document.getElementById('image-desc').innerHTML = imageDescription; 
	 
	 document.all['ar_right'].src="images/ar_right.gif";
	}
  if (p_i<=1)
   { document.all['ar_left'].src="images/none.gif";
     p_i =1;
   }
   else
    { document.all['ar_left'].src="images/ar_left.gif";
	} ;
  document.all['left_a'].blur();
  };