function menu_link(num)
{
	switch(num)

	{

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

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

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

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

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

	}
}