在自定义页面中通过网址获取产品ID？

I've got this problem that I can't solve. Partly because I can't explain it with the right terms. I'm new to this so sorry for this clumsy question.

Below you can see an overview of my goal.

i created one custom module in my magento,Its working great.

Using this i created that one http://www.phparrow.com/magento/magento-create-a-simple-module/

in my product page i have a link

<a href = "http://www.example.com/magenaresh/index.php/hello/ "> Click Here </a>

when i click Click Here its redirecting to http://www.example.com/magenaresh/index.php/hello/ this URL upto here every thing is ok...

But now i want to pass the ProductID along with URL

for this i wrote like this

<?php 
    $product_id = $this->getProduct()->getId();
    echo $product_id;
?>

AND

<a href = "http://www.example.com/magenaresh/index.php/hello/<?php echo $product_id ?> ">Click Here</a>

again i clicked on Click Here its showing

Any thing wrong i did here ?

Any Ideas ?

you can add link at you href like

<a href = "http://www.example.com/magenaresh/index.php/hello/index/index/product_id/<?php echo $product_id ?> ">Click Here</a>

And in your controller can access the URL parameters in the exact same way as before;

$id = $this->getRequest()->get('product_id');

hope this will sure help you.

Hello check below code

<a href = "http://www.example.com/magenaresh/index.php/hello/index/index/<?php echo $product_id ?> ">Click Here</a>