function isblank(s) {
    for (var i = 0; i < s.length; i++) {
        var c = s.charAt(i);
        if ((c != ' ') && (c != '\n') && (c != '\t')) return false;
    }
    return true;
}

function handleFocus(f) {
    if (f.value == f.defaultValue) {
        f.value = "";
    }
}
function handleBlur(f) {
    if (f.value == "" || f.value == null || isblank(f.value)) {
        f.value = f.defaultValue;
    }
}
/* sample form validations */
function validateNumberOfDogsOrCatsSelected(sender, args) {
    args.IsValid = $('#ddlNumberOfDogs').val() != 0 || $('#ddlNumberOfCats').val() != 0;
}
function validateDogFoodSampleSelected(sender, args) {
    if ($('#ddlNumberOfDogs').val() != 0 && $('#ddlDogFoodSample').val() == '')
    {
        args.IsValid = false;
        return;
    }
    args.IsValid = true;
}
function validateCatFoodSampleSelected(sender, args) {
    if ($('#ddlNumberOfCats').val() != 0 && $('#ddlCatFoodSample').val() == '') {
        args.IsValid = false;
        return;
    }
    args.IsValid = true;
}