Question

I know there are many good plugins for pretty alert boxes, but I have already made so many alerts, so I wanted to ask if it’s possible to make those alerts prettier without rewriting all alert function calls in the code and replacing this function with other?

Answer 1

You can hijack the default window.alert function:

window.__oldAlert__ = window.alert;
window.alert = function () {
    // your custom alert code here
};

Demo: http://jsfiddle.net/mattball/jMEha/

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Edit

what do I need to write to change it to this plugin? http://thrivingkings.com/apprise

Your page will need jQuery, and the Apprise JS and CSS files.

window.__oldAlert__ = window.alert;
window.alert = function () {
    apprise.apply(this, arguments);
};

Demo: http://jsfiddle.net/mattball/exgBs/