JavaScript - Codigo para ajustar la pantalla

/*

 * jQuery Backstretch

 * Version 1.2.2

 * http://srobbin.com/jquery-plugins/jquery-backstretch/

 *

 * Add a dynamically-resized background image to the page

 *

 * Copyright (c) 2011 Scott Robbin (srobbin.com)

 * Dual licensed under the MIT and GPL licenses.

*/

(function(a){a.backstretch=function(k,i,l){function m(c){try{g={left:0,top:0},d=e.width(),b=d/j,b>=e.height()?(h=(b-e.height())/2,f.centeredY&&a.extend(g,{top:"-"+h+"px"})):(b=e.height(),d=b*j,h=(d-e.width())/2,f.centeredX&&a.extend(g,{left:"-"+h+"px"})),a("#backstretch, #backstretch img:last").width(d).height(b).filter("img").css(g)}catch(o){}typeof c=="function"&&c()}var n={centeredX:!0,centeredY:!0,speed:0},c=a("#backstretch"),f=c.data("settings")||n;c.data("settings");var e="onorientationchange" in window?a(document):a(window),j,d,b,h,g;i&&typeof i=="object"&&a.extend(f,i);a(document).ready(function(){if(k){var b;c.length==0?c=a("<div />").attr("id","backstretch").css({left:0,top:0,position:"fixed",overflow:"hidden",zIndex:-999999,margin:0,padding:0,height:"100px",width:"100px"}):c.find("img").addClass("deleteable");b=a("<img />").css({position:"absolute",display:"none",margin:0,padding:0,border:"none",zIndex:-999999}).bind("load",function(b){var d=a(this),e;d.css({width:"50%",height:"50%"});e=this.width||a(b.target).width();b=this.height||a(b.target).height();j=e/b;m(function(){d.fadeIn(f.speed,function(){c.find(".deleteable").remove();typeof l=="function"&&l()})})}).appendTo(c);a("body #backstretch").length==0&&a("body").append(c);c.data("settings",f);b.attr("src",k);a(window).resize(m)}});return this}})(jQuery);

<script>

	      // Create an array of images that you'd like to use

        var images = [

"/images/inicio/IMG_4453.JPG","/images/inicio/1527_119.jpg","/images/inicio/1527_141.JPG","/images/inicio/IMG_4448.JPG","/images/inicio/IMG_4434.JPG","/images/inicio/IMG_4446.JPG","/images/inicio/2013-06-09 20.46.10.jpg"        ];

        // The index variable will keep track of which image is currently showing

        var index = 0;

        // Call backstretch for the first time,

        // In this case, I'm settings speed of 500ms for a fadeIn effect between images.

        $.backstretch(images[index], {speed: 500});

        // Set an interval that increments the index and sets the new image

        // Note: The fadeIn speed set above will be inherited

        setInterval(function() {

            index = (index >= images.length - 1) ? 0 : index + 1;

            $.backstretch(images[index]);

        }, 5000);

    </script>