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This tutorial tells you about the process to make background of a blog scrollable. It means if the body’s size of blog goes out of screen size, a scroll will be appeared automatically. Let’s see the step by step processes. Jquery is used here.
1.Login to your blogger dashboard–> layout- -> Edit HTML
2.Scroll down to where you see </head>tag .
3.Copy below code and paste it just before the </head> tag .

<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js?ver=1.3.2' type='text/javascript'/>

<script type='text/javascript'>//<![CDATA[$(function(){

// ***// Scrolling background// ***

// height of background image in pixelsvar backgroundheight = 4000;

// get the current minute/hour of the dayvar now = new Date();var hour = now.getHours();var minute = now.getMinutes();

// work out how far through the day we are as a percentage - e.g. 6pm = 75%var hourpercent = hour / 24 * 100;var minutepercent = minute / 30 / 24 * 100;var percentofday = Math.round(hourpercent + minutepercent);

// calculate which pixel row to start graphic from based on how far through the day we arevar offset = backgroundheight / 100 * percentofday;

// graphic starts at approx 6am, so adjust offset by 1/4var offset = offset - (backgroundheight / 1);

function scrollbackground() {// decrease the offset by 1, or if its less than 1 increase it by the background height minus 1offset = (offset < 1) ? offset + (backgroundheight - 1) : offset - 1;// apply the background position$('body').css("background-position", "50% " + offset + "px");// call self to continue animationsetTimeout(function() {scrollbackground();}, 70);}

// Start the animationscrollbackground();});//]]></script>

4.Now scroll down to where you see like this code:

body {background:$bgcolor;margin:0;color:$textcolor;font:x-small Georgia Serif;font-size/* */:/**/small;font-size: /**/small;text-align: center;}

5.Replace above code with below code:

body {background:url(http://1.bp.blogspot.com/_4HKUHirY_2U/Suj7uR3ZKfI/AAAAAAAAAGU/R8pnF8urjTk/bgscroll.jpg);color:$textcolor;font:x-small Georgia Serif;font-size/* */:/**/small;font-size: /**/small;text-align: center;}

Now you can change your background image replacing above red colored code with your image URL. For getting image URL you can host free image here.Have a nice blogging……

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