how to pass value from asp page to user control in model pop up ?

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Hi all,

i have one asp page and one user control. there is a link on page and when i click on that link it will display pop up with that selected record.user control is in pop up.now i want id of that record in popup so i can fetch the data.

i had made a property on user control and assigning id value to that property in my aspx page. like

<uc1:contactus ID="contactusCTL"  runat="server" RecordId='document.getElementById("<%=hdnid.ClientID%>").value' />

so basically how can i get the value of that ID in user control which in opening in model pop up?

thanks,
kk