$(document).ready(function(){
    //resizeContainer();
    
    //$(window).resize(resizeContainer);
});

function resizeContainer()
{
    var container = $('.main-container');
    var sH = document.documentElement.clientHeight?document.documentElement.clientHeight:document.body.clientHeight?document.body.clientHeight:window.innerHeight?window.innerHeight:0;
    var cH = container.height();
    if(sH > cH)
        container.css('margin-top', (sH - cH) / 2);
    container.show();
    $('form > div:first').show();
}