function getloop(surfaceanal) { 
  
    var directory = "sfcloop/";
    var filename = "";
    var area = surfaceanal.map.value;
    var areaindex = surfaceanal.map.selectedIndex;
    var colorindex = surfaceanal.background.selectedIndex;
    if ( surfaceanal.map.options[areaindex].value == "bwsfc" || surfaceanal.map.options[areaindex].value == "ussatsfc" || surfaceanal.map.options[areaindex].value == "satsfc" ) 
    {
     	filename = directory+surfaceanal.map.options[areaindex].value+"_none.html";
    }
    else
    {
        filename = directory+surfaceanal.map.options[areaindex].value+"_"+surfaceanal.background.options[colorindex].value+".html";
    }
    if ( surfaceanal.map.options[areaindex].value == "radsfcus_exp" ) {
        filename = directory+surfaceanal.map.options[areaindex].value+"_test.html";
    }

    window.location = filename;

    return true;
}