[jQuery] Start Animation from Center of Screen

[jQuery] Start Animation from Center of Screen


I have some animated text using the top and left css properties. But,
everything starts from the top left of my screen. How could I make
the animation start from the center, and then float out from there?
Example Page:
http://www.puc.edu/media/reasons/who-is-god
jQuery Code:
<script type="text/javascript">
$(document).ready(function(){
    // Start floater function
    var floater = function()
    {
        $('.floater').each(function() {
            // Random Times
            var timeout = Array();
            timeout[0] = 4000;
            timeout[1] = 5000;
            timeout[2] = 10000;
            timeout[3] = 15000;
            timeout[4] = 20000;
            timeout[5] = 25000;
            timeout[6] = 30000;
            var time = timeout[Math.floor(Math.random() * timeout.length)];
            $(this).animate({
                'marginTop':(Math.random() * $(window).height()) + 'px',
                'marginLeft':(Math.random() * $(window).width()) + 'px'
                        },
                time,'swing',function(){
                    setTimeout(floater,10);
            });// End animate
        });// End each
    }// End floater
    // Execute our function
    floater();
// Stop animation when button is clicked
$('.floater').mouseover(function(){
$(this).stop();
     $(this).children('p').fadeIn('slow');
});
    $('.floater').mouseout(function(){
        //floater();
});
    // Add our colors
    $('.floater').each(function()
    {
        // Create array of colors
        var colors = Array();
        colors[0] = '#66ff44';
        colors[1] = '#9900ff';
        colors[2] = '#ff11ff';
        colors[3] = '#ff2266';
        colors[4] = '#ff7755';
        colors[5] = '#ffbb55';
        colors[6] = '#eeff33';
        // Random hex value
        var color_hex = colors[Math.floor(Math.random() * colors.length)];
        $(this).css('color', color_hex);
    });// End each
});// End ready
</script>