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Create a new php file called Configurable.php and located in app/code/local/XLPages/ManageStock/Block/Product/View/Type/Configurable.php.

create config.xml with the following content and under app/code/local/XLPages/ManageStock/config.xml:

    
        
            0.1.0
        
    
    
        
            
               
                    XLPages_ManageStock_Block_Product_View_Type_Configurable

                
            
        
    

create a file called XLPages_ManageStock.xml with the following content and located
under app/etc/modules/XLPages_ManageStock.xml

  

    
        
            true
            local
        
    

In Admin create a new attribute called backorder_date and add it to your attribut_set, this will let customer knows if the item is on backorder and what is the backorder date.

< ?php

class XLPages_ManageStock_Block_Product_View_Type_Configurable  extends Mage_Catalog_Block_Product_View_Type_Configurable
{
   
	
	public function getJsonConfig()
	{
		$attributes = array();
		$options = array();
		$store = Mage::app()->getStore();
		foreach ($this->getAllowProducts() as $product) {
			$productId  = $product->getId();

			foreach ($this->getAllowAttributes() as $attribute) {

				$productAttribute = $attribute->getProductAttribute();
				$attributeValue = $product->getData($productAttribute->getAttributeCode());

				$options['qty'][$product -> getAttributeText($productAttribute->getName())] = floor($product->getStockItem()->getQty());


				if (!isset($options[$productAttribute->getId()])) {
					$options[$productAttribute->getId()] = array();

				}
				if (!isset($options[$productAttribute->getId()][$attributeValue])) {
					$options[$productAttribute->getId()][$attributeValue] = array();

				}
				$options[$productAttribute->getId()][$attributeValue][] = $productId;

			}
		}

		$this->_resPrices = array(
		$this->_preparePrice($this->getProduct()->getFinalPrice())
		);
		foreach ($this->getAllowAttributes() as $attribute) {
			$productAttribute = $attribute->getProductAttribute();
			$attributeId = $productAttribute->getId();

			$info = array(
			'id'        => $productAttribute->getId(),
			'code'      => $productAttribute->getAttributeCode(),
			'label'     => $attribute->getLabel(),
			'options'   => array()
			);

			$optionPrices = array();
			$prices = $attribute->getPrices();

			if (is_array($prices)) {
				foreach ($prices as $value) {
					if(!$this->_validateAttributeValue($attributeId, $value, $options)) {
						continue;
					}
					if($attribute->getLabel() != "Color") {
						$products= $options[$attributeId][$value['value_index']];
                                                $numItems= count($products)
						for($i=0;$i<$numItems;$i++){
							$backoder_date=null;
							$a = array(0 => $products[$i]);
							$stockItem = Mage::getModel('cataloginventory/stock_item')->loadByProduct($products[$i]);
							$currentItem = Mage::getModel('catalog/product')->load($products[$i]);
							$info['options'][] = array(
							'id'    => $value['value_index'],
							'label' => ($stockItem->getQty() <= 0) ? $value['label'] . ' (out of stock'.$this->formatDate($currentItem ->getData('backorder_date')).")" : $value['label'],
							//'price' => $this->_preparePrice($value['pricing_value'], $value['is_percent']),
							'price' =>  $this->_registerJsPrice($this->_convertPrice($currentItem ->getData('price'))) - $this->_registerJsPrice($this->_convertPrice($this->getProduct()->getPrice())),
							'products'   => isset($options[$attributeId][$value['value_index']]) ? $a : array(),
							);
						}
					} else {
						$info['options'][] = array(
						'id'    => $value['value_index'],
						'label' => $value['label'],
						'price' => $this->_preparePrice($value['pricing_value'], $value['is_percent']),
						'products'   => isset($options[$attributeId][$value['value_index']]) ? $options[$attributeId][$value['value_index']] : array(),
						);
					}
					$optionPrices[] = $this->_preparePrice($value['pricing_value'], $value['is_percent']);
				}

			}
			/**
             * Prepare formated values for options choose
             */
			foreach ($optionPrices as $optionPrice) {
				foreach ($optionPrices as $additional) {
					$this->_preparePrice(abs($additional-$optionPrice));
				}
			}
			if($this->_validateAttributeInfo($info)) {
				$attributes[$attributeId] = $info;
			}
		}
		$config = array(
		'attributes'=> $attributes,
		'template'  => str_replace('%s', '#{price}', $store->getCurrentCurrency()->getOutputFormat()),
		'prices'    => $this->_prices,
		'basePrice' => $this->_registerJsPrice($this->_convertPrice($this->getProduct()->getFinalPrice())),
		'oldPrice'  => $this->_registerJsPrice($this->_convertPrice($this->getProduct()->getPrice())),
		'productId' => $this->getProduct()->getId(),
		'chooseText'=> Mage::helper('catalog')->__('Choose option...'),
		);
		return Zend_Json::encode($config);
	}
	
	function formatDate($date){
	   $_date = explode(" ", $date);
	     if($_date[0] != ""){
        	return " ~ ".$_date[0]; 
        }
	}
}

?>

NB: If you are using Magento 1.4 version, the function getJsonConfig() must be replaced by this new one (see below).

< ?php
class Ayasoftware_SimpleProductPricing_Catalog_Block_Product_View_Type_Configurable  extends Mage_Catalog_Block_Product_View_Type_Configurable
{
public function getJsonConfig() {
	    $attributes = array();
		$options = array();
		$store = Mage::app()->getStore();
		foreach ($this->getAllowProducts() as $product) {
			$productId  = $product->getId();
			foreach ($this->getAllowAttributes() as $attribute) {
				$productAttribute = $attribute->getProductAttribute();
				$attributeValue = $product->getData($productAttribute->getAttributeCode());
				if (!isset($options[$productAttribute->getId()])) {
					$options[$productAttribute->getId()] = array();
				}

				if (!isset($options[$productAttribute->getId()][$attributeValue])) {
					$options[$productAttribute->getId()][$attributeValue] = array();
				}
				$options[$productAttribute->getId()][$attributeValue][] = $productId;
			}
		}

		$this->_resPrices = array(
		$this->_preparePrice($this->getProduct()->getFinalPrice())
		);
		$optionsLabel = array();
		foreach ($this->getAllowAttributes() as $attribute) {
			array_push($optionsLabel, $attribute->getLabel()) ;
		}
		$numberOfOptions =  count($optionsLabel);
		foreach ($this->getAllowAttributes() as $attribute) {
			$productAttribute = $attribute->getProductAttribute();
			$attributeId = $productAttribute->getId();
			$info = array(
			'id'        => $productAttribute->getId(),
			'code'      => $productAttribute->getAttributeCode(),
			'label'     => $attribute->getLabel(),
			'options'   => array()
			);
			$optionPrices = array();
			$prices = $attribute->getPrices();
			if (is_array($prices)) {
				foreach ($prices as $value) {
					if(!$this->_validateAttributeValue($attributeId, $value, $options)) {
						continue;
					}					
					if($attribute->getLabel() == $optionsLabel[$numberOfOptions - 1]) {
					   $products= $options[$attributeId][$value['value_index']];
                       $numItems= count($products);
						for($i=0;$i<$numItems;$i++){
							$backoder_date=null;
							$a = array(0 => $products[$i]);
							$stockItem = Mage::getModel('cataloginventory/stock_item')->loadByProduct($products[$i]);
							$currentItem = Mage::getModel('catalog/product')->load($products[$i]);
							$info['options'][] = array(
							'id'    => $value['value_index'],
							'label' => ($stockItem->getQty() <= 0) ? $value['label'] . ' (out of stock) ' : $value['label'],
							'price' =>  $this->_registerJsPrice($this->_convertPrice($currentItem ->getData('price'))) - $this->_registerJsPrice($this->_convertPrice($this->getProduct()->getPrice())),
							'products'   => isset($options[$attributeId][$value['value_index']]) ? $a : array(),
							);
						}
					} else {
						$info['options'][] = array(
						'id'    => $value['value_index'],
						'label' => $value['label'],
						'price' => $this->_preparePrice($value['pricing_value'], $value['is_percent']),
						'products'   => isset($options[$attributeId][$value['value_index']]) ? $options[$attributeId][$value['value_index']] : array(),
						);
					}
					$optionPrices[] = $this->_preparePrice($value['pricing_value'], $value['is_percent']);
				}

			}
			
			/**
             * Prepare formated values for options choose
             */
			foreach ($optionPrices as $optionPrice) {
				foreach ($optionPrices as $additional) {
					$this->_preparePrice(abs($additional-$optionPrice));
				}
			}
			if($this->_validateAttributeInfo($info)) {
				$attributes[$attributeId] = $info;
			}
		}

		$_request = Mage::getSingleton('tax/calculation')->getRateRequest(false, false, false);
		$_request->setProductClassId($this->getProduct()->getTaxClassId());
		$defaultTax = Mage::getSingleton('tax/calculation')->getRate($_request);

		$_request = Mage::getSingleton('tax/calculation')->getRateRequest();
		$_request->setProductClassId($this->getProduct()->getTaxClassId());
		$currentTax = Mage::getSingleton('tax/calculation')->getRate($_request);

		$taxConfig = array(
		'includeTax'        => Mage::helper('tax')->priceIncludesTax(),
		'showIncludeTax'    => Mage::helper('tax')->displayPriceIncludingTax(),
		'showBothPrices'    => Mage::helper('tax')->displayBothPrices(),
		'defaultTax'        => $defaultTax,
		'currentTax'        => $currentTax,
		'inclTaxTitle'      => Mage::helper('catalog')->__('Incl. Tax'),
		);

		$config = array(
		'attributes'        => $attributes,
		'template'          => str_replace('%s', '#{price}', $store->getCurrentCurrency()->getOutputFormat()),
		'basePrice'         => $this->_registerJsPrice($this->_convertPrice($this->getProduct()->getFinalPrice())),
		'oldPrice'          => $this->_registerJsPrice($this->_convertPrice($this->getProduct()->getPrice())),
		'productId'         => $this->getProduct()->getId(),
		'chooseText'        => Mage::helper('catalog')->__('Choose an Option...'),
		'taxConfig'         => $taxConfig,
		);

		return Mage::helper('core')->jsonEncode($config);
	}
}
?> 

want to disable the selection if it shows "out of stock? replace this bloc in js/varien/product.js

 if(allowedProducts.size()>0){
                	
                    options[i].allowedProducts = allowedProducts;
                    var option_label = this.getOptionLabel(options[i], options[i].price);
                    element.options[index] = new Option(option_label, options[i].id);
                   if(option_label.indexOf('stock') !== -1) {
                    $(element.options[index]).addClassName('disabled');
					element.options[index].disabled = true;
                    }
                    element.options[index].config = options[i];
                    index++;
                }

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