function get_auto_pos (screen_width,base_obj_width,rescale_value,base_obj_offset)
{//a1


// we have to handle items on the left and on the right differently
if (base_obj_offset > 0) 
{
var tmp =  ((screen_width - (base_obj_width * rescale_value)) / 2) + (base_obj_offset * rescale_value) + 'px';

} else
{
var tmp =  ((((screen_width - (base_obj_width * rescale_value)) / 2) / screen_width) * 100 ) + (((base_obj_offset * rescale_value) / screen_width)*100) + '%';
}
return tmp;

} //a1