Might I suggest something like this (if you use jQuery, if not you hopefully get the gist)
Code:
var handler = function(event) {
event.preventDefault();
var confirmed = window.confirm('Did you search for your issue before you clicked this button?')
if (confirmed) {
window.location.href = event.target.href;
}
}
$('.newcontent_textcontrol').on('click', handler);