function ShowImage( gid, id, inc )
{

	cnt_input = document.getElementById(gid + '_cnt_'+id);
	arr_input = document.getElementById(gid + '_arr_'+id);

	cnt = parseInt(cnt_input.value);
	arr = arr_input.value.split(',');

	cnt += inc;

	if (cnt > arr.length)
		return;

	if (cnt < 0)
		return;

	img = document.getElementById(gid + '_img_' + id );
	div = document.getElementById(gid + '_div_'+id );
	link_forward = document.getElementById( gid + '_flink_'+id );
	link_back = document.getElementById( gid + '_blink_'+id );

	img.src = arr[ cnt ];

	if ( cnt == arr.length-1 )
		link_forward.style.display = 'none';
	else
		link_forward.style.display = 'inline';

	if ( cnt == 0 )
		link_back.style.display = 'none';
	else
		link_back.style.display = 'inline';

	div.innerHTML = ' ' + (cnt+1) + ' θη ' + arr.length;
	
	cnt_input.value = cnt;
	
}