using function parameter as url parameter

I list the resultset from a db query and want to link to the detail page.
Of course I have to pass the id as an URL parameter to the detail page.
Now because I want to open the detailpage in a separate window I use JavaScripts window.open function.
I tried it with a function to which the Id is given as a parameter but I can’t reuse it or append the variable value to the pagename.

What is wrong?

My function looks like this:

[code]
function handydetails(Id)
{
window.open(“handydetails.php?Id=” + Id + “”, “Handydetails”, “location=no, directories=no, menubar=no, scrollbars=yes, toolbar=no, status=no, width=786″”);
}
[/code]

and its called like this:

[code=php]
<a href=”javascript:handydetails(<?php echo urlencode($rchandys->Fields(‘nr’)) ?>);”><?php echo $rchandys->Fields(‘marke’); ?></a>
[/code]

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