Browser Alert Styling [duplicate]

Question

This question already has an answer here:

• How to create and apply CSS to javascript Alert 5 answers

I currently have a contact form that when completed triggers a browser alert/popup but i would like to style the popup to be more like a modal. So the popup would be centred & overlaid on the page with a dark transparent background that fades away when clicked - is this possible?

Here is my current script triggering the popup alert: http://jsfiddle.net/xf4C6/

function fcheckf(){
var x = document.getElementById('check').value;
if(x == 0)
{
    return false;
} 
else
{
     alert("Your message has been sent! Thank you for getting in touch.");
}
 }

Answer 1

Oki doki heres my answer:

HTML

<div id="popup" style="width:250px;height:250px;background-color:rgba(255,255,255,0.5);border:3px solid black;display:none;z-index:999;position:absolute;top:50%;left:50%;margin-left:-125px;margin-top:-125px;">
        <div style="width:230px;height:230px;margin-left:10px;margin-top:10px;background-color:#FFFFFF;">
            Thank you for submitting your details<p>
            <div onclick="document.getElementById('popup').style.diplay='none';" style="margin-left:auto;margin-right:auto;width:75px;height:30px;background-color:#000000;cursor:hand;">
                Close
            </div>
        </div>
</div>

Javascript

Change

alert("Your message has been sent! Thank you for getting in touch.");

to

document.getElementById("popup").style.display="block";

Answer 2

you can use jquery ui dialog

see documentation