How to call helper class magento

Question

I am trying to call a helper class in magento but am stuck with an error message from magento.

Helper class is in

Application / Code / Kernel /Mage/Catalog/Helper/Product/Compare.php

Class name

class Mage_Catalog_Helper_Product_Compare extends Mage_Core_Helper_Url 

I tried the following call

 $helper=Mage::helper('catalog_product_compare'); 

Error message I received

Fatal error: class 'Mage_Catalog_Product_Compare_Helper_Data' not found in C: \ xampp \ htdocs

What can I call this helper class?

Answer 1

Like this:

 $helper = Mage::helper('catalog/product_compare');