addLoadEvent(setupHandler);

function validate() {
    var f = document.form1;
    
    var Valid = checkPositiveDecimal(document.getElementById("EnergyTextBox").value);
    needErrorStyle(!Valid);
    return Valid;
}

function needErrorStyle(b) {
    document.getElementById("EnergyTextBox").className = b ? "InvalidTextBox":"TextBox";
}

function setupHandler() {
    document.getElementById("EnergyTextBox").onkeydown = function() {needErrorStyle(false);}
}

function checkPositiveDecimal(val) {
    try {
        var twice = 2*val;
        if(twice > 0) {
            return true;
        }
        else {
            return false;
        }
    }
    catch(ex) {
        return false;
    }
}