function leftmenu(showHideDiv) {
var menu_leght = 6;
       for(var i=1; i<= menu_leght; i++) { 
	   var img = document.getElementById('left_menu' + i);
	   var submenu = document.getElementById('lm' + i);
	       if (img != null && submenu != null ){
               if (i == showHideDiv) {
				   if(img.src.search(/menu_arrow.jpg/) != -1){
                      submenu.style.display = 'block';
					  img.src = img.src.replace(/menu_arrow.jpg/, "menu_arrow_down.jpg");
				   }else{
					  submenu.style.display = 'none';
					  img.src = img.src.replace(/menu_arrow_down.jpg/, "menu_arrow.jpg");
				   }
               }
               else {
                      submenu.style.display = 'none';
					  img.src = img.src.replace(/menu_arrow_down.jpg/, "menu_arrow.jpg");
               }
         }
       }
}