function switch_img_rooms(id_div, id_img, img_file, nsw, nsh)
{
  current_img = document.getElementById(id_img).src.substr( document.getElementById(id_img).src.lastIndexOf('/')+1 );
  new_img     = img_file.substr( img_file.lastIndexOf('/')+1 );

  if ( current_img == new_img )
  {
    document.getElementById(id_img).style.visibility	= 'hidden';
    document.getElementById(id_img).src 							= '';
  }
  else
  {
    document.getElementById(id_img).src 								= img_file;
    document.getElementById(id_img).style.visibility		= 'visible';
    document.getElementById(id_img).width 							= nsw;
    document.getElementById(id_img).height 							= nsh;
    
    document.getElementById(id_div).width 							= nsw;
    document.getElementById(id_div).height 							= nsh;
    /*
	offsetW	= (400-nsw) / 2;
    offsetH	= (380-nsh) / 2;
    
    alert(offsetW+' '+offsetH);

	document.getElementById(id_img).style.marginLeft 	= offsetW+'px';
    document.getElementById(id_div).style.marginLeft 	= offsetW+'px';
    document.getElementById(id_img).style.marginTop 	= offsetH+'px';
    document.getElementById(id_div).style.marginTop 	= offsetH+'px';
    */
    
    if ( (nsw-nsh) < -20 )
    {
    	document.getElementById(id_img).style.marginLeft 	= '40px';
    	document.getElementById(id_div).style.marginLeft 	= '40px';
		document.getElementById(id_img).style.marginTop 	= '0px';
    	document.getElementById(id_div).style.marginTop 	= '0px';
    }
    else if ( nsw > nsh )
    {
    	document.getElementById(id_img).style.marginLeft 	= '0px';
    	document.getElementById(id_div).style.marginLeft 	= '0px';
    	document.getElementById(id_img).style.marginTop 	= '27px';
    	document.getElementById(id_div).style.marginTop 	= '27px';
    }
    else
    {
		document.getElementById(id_img).style.marginLeft 	= '0px';
    	document.getElementById(id_div).style.marginLeft 	= '0px';
    	document.getElementById(id_img).style.marginTop 	= '0px';
    	document.getElementById(id_div).style.marginTop 	= '0px';
    }
    
  }
}

function hide_img(id)
{
  document.getElementById(id).style.visibility = 'hidden';
  document.getElementById(id).src = '';
}