<!--hide from old browsers

//var zoom=10;
var zoom=80;

var url = "http://map.gmn-usa.com/cgi-bin/plotpos.pl?fleet=iaato&user="
 + "polarpioneer"
         + "&pw=ushuaia&x=400&y=267&zoom=" ;

var iniurl = url + zoom;

function updateframe (vessel)
{
     frames[vessel].location.href= url + zoom;
}

function zoomin (vessel)
{
     zoom = zoom/2;
     updateframe(vessel);
}

function zoomout (vessel)
{
     zoom = zoom*2;
     updateframe(vessel);
}

//-->