I want to make my blog posts appear with a short main page, with a "Read More" button if someone wants to read the whole article. I tried the code below, but it shows both the short and expanded article on the main page.
1)
<script type='text/javascript'>
var thumbnail_mode = "float" ;
summary_noimg = 230;
summary_img = 140;
img_thumb_height = 100;
img_thumb_width = 100;
</script>
<script src='http://blogergadgets.googlecode.com/files/excerpt.js' type='text/javascript'/>
</head>
2)
<b:if cond='data:blog.pageType == "item"'>
<data:post.body/>
<b:else/>
<div expr:id='"summary" + data:post.id'>
<data:post.body/>
</div>
<script type='text/javascript'>
createSummaryAndThumb("summary<data:post.id/>");
</script>
<span style='padding-top:5px;;float:right;text-align:right;'><a expr:href='data:post.url' rel='bookmark'><b>Read more >></b></a></span>
</b:if>
Why don't you try this one ?
http://www.bloggerbuster.com/2009/09/how-to-add-bloggers-read-more-function.html