Tutorial:leer mas

Diseñoplantillaexpandir artilugios
buscas este codigo

<data:post.body/>

y sustituye el 1ero por este

<b:if cond='data:blog.pageType != &quot;item&quot;'><b:if cond='data:blog.pageType != &quot;static_page&quot;'><div expr:id='&quot;summary&quot; + data:post.id'><data:post.body/></div><script type='text/javascript'>createSummaryAndThumb(&quot;summary<data:post.id/>&quot;);</script><span class='rmlink' style='float:right'><a expr:href='data:post.url'>Leer más...</a></span></b:if></b:if><b:if cond='data:blog.pageType == &quot;item&quot;'><data:post.body/></b:if><b:if cond='data:blog.pageType == &quot;static_page&quot;'><data:post.body/></b:if>

pega antes de </head>este codigo

<script type='text/javascript'>
summary_noimg = 400;
summary_img = 300;
img_thumb_height = 125;
img_thumb_width = 125;
</script>

<script type='text/javascript'>
//<![CDATA[

/******************************************

(C)2008 by Anhvo

visit http://en.vietwebguide.com to get more cool hacks
********************************************/
function removeHtmlTag(strx,chop){
if(strx.indexOf("<")!=-1)
{
var s = strx.split("<");
for(var i=0;i<s.length;i++){
if(s[i].indexOf(">")!=-1){
s[i] = s[i].substring(s[i].indexOf(">")+1,s[i].length);
}
}
strx = s.join("");
}
chop = (chop < strx.length-1) ? chop : strx.length-2;
while(strx.charAt(chop-1)!=' ' && strx.indexOf(' ',chop)!=-1) chop++;
strx = strx.substring(0,chop-1);
return strx+'...';
}

function createSummaryAndThumb(pID){
var div = document.getElementById(pID);
var imgtag = "";
var img = div.getElementsByTagName("img");
var summ = summary_noimg;
if(img.length>=1) { 
imgtag = '<span style="float:left; padding:0px 10px 5px 0px;"><img src="'+img[0].src+'" width="'+img_thumb_width+'px" height="'+img_thumb_height+'px"/></span>';
summ = summary_img;
}

var summary = imgtag + '<div>' + removeHtmlTag(div.innerHTML,summ) + '</div>';
div.innerHTML = summary;
}

//]]>
</script>

donde dice leer mas pones este codigo para una iamgen

<img src="URL de la imagen" />

si quieres una imagen me la pides!!
te dejo 1