<script type="text/javascript">
$(document).ready(function() {
var clicked = false;

$(document).click(function() {
if (clicked == false) {
var popup = window.open('http://www. Put URL Here.com');
clicked = true;
};
});

});
</script>
will make a pop on click if this is what you mean to do. Insert anywhere in the body.

If that's not it, provide some more info.