function menu_link(num)
{
	switch(num)

	{

	  case 1:window.location="index.htm" ;break;

	  case 2:window.location="catalog.htm" ;break;

	  case 3:window.location="news.htm" ;break;

	  case 4:window.location="about_us.htm" ;break;

	  case 5:window.location="Warnings_copyright.htm" ;break;

	  case 6:window.location="contact_us.htm" ;break;


	}
}