Answers for "force resize event onload"

trigger window resize

// Cross-browser solution (IE support)
var resizeEvent = window.document.createEvent('UIEvents'); 
resizeEvent.initUIEvent('resize', true, false, window, 0); 
window.dispatchEvent(resizeEvent);

on window resize and on page load

// Bind to the resize event of the window object
$(window).on("resize", function () {
    // Set .right's width to the window width minus 480 pixels
    $(".content .right").width( $(this).width() - 480 );
// Invoke the resize event immediately
}).resize();