Not sure if you still need help with doing more than 3, but I just made it work today.
You have to edit the file called validation.js and add in the additional OS Values.
Validation.js is located under \common\js
Starting at Line #256 - I expanded it to have 6 options, but you could go for as many as you want:
sHTML = "<option value='OSValue1'>" + oEnvironment("OSName1") + "</option>\n";
if(oEnvironment("OSName2"))
{sHTML = sHTML + "<option value='OSValue2'>" + oEnvironment("OSName2") + "</option>\n";
}
if(oEnvironment("OSName3"))
{sHTML = sHTML + "<option value='OSValue3'>" + oEnvironment("OSName3") + "</option>\n";
}
if(oEnvironment("OSName4"))
{sHTML = sHTML + "<option value='OSValue4'>" + oEnvironment("OSName4") + "</option>\n";
}
if(oEnvironment("OSName5"))
{sHTML = sHTML + "<option value='OSValue5'>" + oEnvironment("OSName5") + "</option>\n";
}
if(oEnvironment("OSName6"))
{sHTML = sHTML + "<option value='OSValue6'>" + oEnvironment("OSName6") + "</option>\n";
}
sHTML = "<select id='ImageDropDown' name='ImageDropDown'>\n" + sHTML + "</select>";
sHTML = sHTML + "<div class='coupontooltip' style = 'border:1px solid black; padding: 10px;'>\n";
sHTML = sHTML + oEnvironment("Tooltip1");
sHTML = sHTML + "</div>\n";
document.getElementsByName('tblNewDetails').item(0).innerHTML = sHTML;
// process the refresh bits...
sHTML = "<option value='OSValue1'>" + oEnvironment("OSName1") + "</option>\n";
if(oEnvironment("OSName2"))
{sHTML = sHTML + "<option value='OSValue2'>" + oEnvironment("OSName2") + "</option>\n";
}
if(oEnvironment("OSName3"))
{sHTML = sHTML + "<option value='OSValue3'>" + oEnvironment("OSName3") + "</option>\n";
}
if(oEnvironment("OSName4"))
{sHTML = sHTML + "<option value='OSValue4'>" + oEnvironment("OSName4") + "</option>\n";
}
if(oEnvironment("OSName5"))
{sHTML = sHTML + "<option value='OSValue5'>" + oEnvironment("OSName5") + "</option>\n";
}
if(oEnvironment("OSName6"))
{sHTML = sHTML + "<option value='OSValue6'>" + oEnvironment("OSName6") + "</option>\n";
}
I just tested it with OS #6 and it's working great. Hope this helps.