AJAX :: Get ClientID Of Control Using JQuery

function verifyEmail() {
var pageUrl = '<%=ResolveUrl("~/UserInterface/StaffPortal/StaffRegister.aspx")%>'
var verifyEmail = '{verifyEmail:"' + $('#<%=Text_email.ClientID%>').val() + '"}';
}

Above function is a little part of whole actual function where I'm using json to store data of textbox in variable and pass as a parameter in query.

as seen in above funtion I'm using 

<%=Text_email.ClientID%>'

How can i pass this as parameter and use the same function for more than one textboxes? 

function verifyEmail(idd) {
var pageUrl = '<%=ResolveUrl("~/UserInterface/StaffPortal/StaffRegister.aspx")%>'
var verifyEmail = '{verifyEmail:"' + $('#'+idd+'').val() + '"}';
}

I've tried above code. I've called function using verifyEmail('<%=Text_email.ClientID%>'); but it is not working.

When I alert idd then it prompts <%=Text_email.ClientID%> but when i pass variable idd in $('#+idd+') it doesnt work?