This is the code you put in include/func/func.product.php just before "return $product"
Code:
$product["product"] = $product['manufacturer'] . " " . $product['product'];
and it will show just like you want it. If you want to manually show it somewhere in skin1/customer/main/product.tpl you call it like this
If you want the product title to be with manufacturer name change the first code like this
Code:
$product["producttitle"] = $product['manufacturer'] . " " . $product['product'];