允许弹出窗口提醒

I am trying to get so that when a user clicks ok on the alert, it will allow pop ups for my site. My current code is:

var w = window.open( "urls","_blank", "height = 200, width = 300, top=450, left=1025" );
if(w == null || typeof(win) == "undefined" || win.location.href == 'about:blank') {
alert("You must allow pop ups before continuing, click the button to allow pop ups");
}

How may i achieve this please or if not possible, how can i achieve a way so that they can allow pop ups for my site easily with out having to ask them to allow by going in to the browsers settings.

Many thanks

Why don't just randomize the href in the anchor tag? Es:

<a href="" id="randLink" target="_blank">Open a random site</a>

Imagine a jquery function that: when the page is first loaded chooses one of your random sites and puts the link in the href of #randLink:

$(document).ready(function() {
    $('#randLink').attr('href',generateRandUrl());
});

and that on each click, changes the href value:

$( "#randLink" ).click(function() {
 $('#randLink').attr('href',generateRandUrl());
});

generateRandUrl() is a function that returns the string value of one of your websites