How do you assign a value to a hidden input field based on a url parameter using jquery

Hi,

I have a function that will change the value of a hidden input based on an <a> click.

What I would like to have, is first the hidden field getting a value assigned to it based on a URL parameter.  The URl will have "subjectId=" with a number assigned to it..... ( So, it could be subjectId=7.... and the hidden input (recipientId) will have a value assigned to it when the page loads.

Here is what I have so far.

Thanks,

 <script type="text/javascript">
$(document).ready(function() { 
    $("div a").click(function() {
        $("#ForMembers,#Coverage,#GenInfo").removeClass("active")
        $(this).closest("div").addClass("active")
        var v = $(this).attr("id");
        $("#recipientId").val(v);
   	if($("#recipientId").val()==6 || $("#recipientId").val()==7 || $("#recipientId").val()==8) {
	$("#contactForm").show();
		}
	else {
		$("#contactForm").hide ();
	}	
    });
});
</script

<input type="hidden" id="recipientId" name="recipientId" value=""  />

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