function SwitchMenu(obj, image, act_img) {

  if(document.getElementById("main_menu_"+obj) && document.getElementById("sub_menu"+obj))    {
    var el = document.getElementById("main_menu_"+obj);
	var ar = document.getElementById("sub_menu"+obj);
	var ol = document.getElementById("img_"+obj);
	var am = el.getElementsByTagName("a");
	var im = el.getElementsByTagName("img");
		
    if(ar.style.display == "none"){
      ar.style.display = "block";	  
	  am[0].className="act_l_m";	
	  ol.src=act_img;	
    } else {
      ar.style.display = "none";
	  am[0].className="l_m";
	  ol.src=image;
    }
  }
}