@mugur, Sorry, if the link above is missing, you can use the following code
$productSku = $_product->getSku();
$product = Mage::getModel('catalog/product');
$productId = $product->getIdBySku( $productSku );
$product = Mage::getModel("catalog/product")->load($productId);
$attVal = $product->getOptions();
$optStr = "";
foreach($attVal as $optionKey => $optionVal) {
$optStr .= "<select style="display: block; clear: both;" name="options[".$optionVal->getId()."]">";
foreach($optionVal->getValues() as $valuesKey => $valuesVal) {
$optStr .= "<option value="".$valuesVal->getId()."">".$valuesVal->getTitle()."</option>";
}
$optStr .= "</select>";
}
echo($optStr);
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