1. FIRST STEP
First Backup the template. Then login at Blogger.com and click Layout link on Dashboard. On Page Elements tab click Edit Html subtab of Layout tab. In Template Code box scroll down to this code :
@media all {
div#main {
float:$endSide;
width:66%;
padding-top:30px;
padding-$endSide:0;
padding-bottom:10px;
padding-$startSide:1em;
border-$startSide:dotted 1px $bordercolor;
word-wrap: break-word; /* fix for long text breaking sidebar float in IE */
overflow: hidden; /* fix for long non-text content breaking IE sidebar float */
}
Change the width line from 66% to 35%. This is because we will make the second sidebar of the same width as first sidebar (31%). Save Template. Next this Posts column is at the right ($endside). We want this to be in middle so we change the float line to ($startside). After modification the code will look like this :
@media all {
div#main {
float:$startSide;
width:35%;
padding-top:30px;
padding-$endSide:0;
padding-bottom:10px;
padding-$startSide:1em;
border-$startSide:dotted 1px $bordercolor;
word-wrap: break-word; /* fix for long text breaking sidebar float in IE */
overflow: hidden; /* fix for long non-text content breaking IE sidebar float */
}
2. DEFINE NEW SIDEBAR
To define a new sidebar copy the following code and paste it immediately after the code for the Main Column shown above in the first step :
div#sidebar2 {
margin-top:20px;
margin-$endSide:0px;
margin-bottom:0px;
margin-$startSide:0;
padding:0px;
text-align:$startSide;
float: $endSide;
width: 31%;
word-wrap: break-word; /* fix for long text breaking sidebar float in IE */
overflow: hidden; /* fix for long non-text content breaking IE sidebar float */
}
We have floated this new sidebar to the right (float: $endSide;). It has same width as the first sidebar (31%). Also it mirrors the first sidebar in other parameters.
3. MODIFYING THE BODY CODE
Scroll down to see the code after the <body> tag. Use Edit--->Cut (Ctrl+X) to cut out the code for the Posts Column (Main) :
<div id='main-wrapper'>
<b:section class='main' id='main' showaddelement='no'>
<b:widget id='Blog1' locked='true' title='Blog Posts' type='Blog'/>
</b:section>
</div>and paste it after the first sidebar code block :
<div id='sidebar-wrapper'>
<b:section class='sidebar' id='sidebar' preferred='yes'>
</b:section>
</div>Save Template.
4. THE NEW SIDEBAR CODE
Lastly to show the new sidebar column on the blog copy and paste this code after the new position of the (Main) Post Columns code :
<div id='sidebar-wrapper'>
<b:section class='sidebar2' id='sidebar2' preferred='yes'>
</b:section>
</div>Enjoy!