function CalculateFluidWeight()
{
    var disp = "";
    var fluid = document.getElementById("ddFluids").value;
    if (fluid == "WhaleOil")
        disp = "Stop Whaling NOW!";
    else
    {
        var litres = parseFloat(document.getElementById("_txtLitres").value);
        var m3 = litres / 1000;
        var weight = 0;
        if (fluid.indexOf("-") != -1)
        {            
            var from = parseFloat(fluid.substring(0, fluid.indexOf("-"))) * m3;
            var to = parseFloat(fluid.substring(fluid.indexOf("-") + 1)) * m3;
            disp = RoundTo(from, 2) +" to "+ RoundTo(to, 2);
        }
        else
        {
            weight = m3 * parseFloat(fluid);
            disp = RoundTo(weight, 2);
        }
    }
    document.getElementById("lblFluidWeight").innerHTML = disp;
}
function Window_onload()
{
    document.getElementById("_txtLitres").value = document.getElementById("hdnFilledVolume").value;
    CalculateFluidWeight();
    SetNumeric();
    new Image().src = "images/TankHemi.gif";
}
function RoundTo(val, places)
{
    places = Math.pow(10, places);
    d = Math.round(val * places) / places;
    return d;
}
function TankType()
{
    if (document.getElementById("rbHemiEnds").checked)
        document.images["imgTankType"].src = "images/TankHemi.gif";
    else
        document.images["imgTankType"].src = "images/TankPlain.gif";
}
function Form_onsubmit()
{
    if (!CheckLimit("Tank"))
        return false;
    return true;
}