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product details

<?php 
require_once("../../app/Mage.php");
umask(0);
Mage::app();
ini_set('display_errors', 1);
$productId = $_REQUEST['productid'];
$model = Mage::getModel('catalog/product') ;
$_product = $model->load($productId);
 $prod_data['id']=$_product->getId();
 $prod_data['name']=$_product->getName();
 $prod_data['price']=$_product->getPrice();
$sp=0;
$sp=$_product->getSpecialPrice();
//echo $_product->getPrice(); //product's regular Price

if($sp<=0)
{
$sp=$_product->getPrice();
}
$prod_data['special_price']=$sp;
$prod_data['images'][0]['img']=(string)Mage::helper('catalog/image')->init($_product, 'thumbnail');
$prod_data['images'][1]['img']=(string)Mage::helper('catalog/image')->init($_product, 'small_image');
$prod_data['images'][2]['img']=(string)Mage::helper('catalog/image')->init($_product, 'image');

$data['simple_product']=$prod_data;


 $_product->img=(string)Mage::helper('catalog/image')->init($_product, 'thumbnail');
$_product->img1=(string)Mage::helper('catalog/image')->init($_product, 'small_image');
$_product->img2=(string)Mage::helper('catalog/image')->init($_product, 'image');
//$data['simple_product'] = $_product->getData();
if($_product->isConfigurable()){
    $childProducts = Mage::getModel('catalog/product_type_configurable')
                        ->getUsedProducts(null,$_product);
    $sproducts = array();                   
    $i=0;
    foreach($childProducts as $child) {
        $child = $obj->load($child->getId());
          $sproducts[$i]['id'] = $child->getId();
          $sproducts[$i]['price'] = $child->getPrice();
          $sproducts[$i]['special_price'] = (string)$child->getFinalPrice();
          $sproducts[$i]['option_id'] = $child->getSize();
          $sproducts[$i]['option_value'] = $child->getAttributeText('size');
          $sproducts[$i]['attribute_id'] = Mage::getResourceModel('eav/entity_attribute')
    ->getIdByCode('catalog_product', 'size');
    $i++;
    }
    $data['child'] = $sproducts;
}
echo json_encode($data);