try this,
Read the query string value from url[
^] and append the value to the url.
use
onclick
event to call the javascript function to navigate to the link with modified query string.
<a onclick="goToLink()" href="#">Link Name</a>
function goToLink() {
var url = '../ISReports/TeachersList.aspx?Inst_code=';
var ques = getParameterByName('Ques');
url = url + ques;
window.location = url;
}