display width of browser window in an element

browserWidth.js

// store wrap div in a variable
$container = $( "body" );

if ( $( "#special" ).length ) {
    // element where we will display the document width
    $documentWidth = $( '#curr_size' );

    // display document width in the container
    $documentWidth.text( $container.width() + " px" );

    // fire event when window is resized
    $( window ).resize( function(){

        // display document width in the container
        $documentWidth.text( $container.width() + " px" );

    });
};