function menu_link(num)
{
	switch(num)

	{

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

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

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

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

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

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

	}
}