I wanted to do this on Blogger too but there are some problems with that.
First problem: You can not upload .jar files to Blogger. (As far as I know).
I do not have a real solution for the first problem. But you can of course put your .jar on any website you want. I chose my Google Pages account to do so.
The code for my Splash example is:
<div id="deployJavaApplet1Overlay" style="background: white none repeat scroll 0% 0%; position: absolute; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; visibility: hidden;">
<table margin="0" padding="0" border="0" height="200" width="200">
<td align="center" valign="middle">
<img imgheight="100" src="http://dl.javafx.com/javafx-loading-100x100.gif" width="100" />
<div id="deployJavaApplet1" style="position: relative; left: 0px;">
<applet archive="http://alexander.egger.googlepages.com/Splash.jar,http://dl.javafx.com/applet-launcher__V1.1.1.jar,http://dl.javafx.com/javafx-rt__V1.1.1.jar,http://dl.javafx.com/fxdloader__V1.1.1.jar,http://dl.javafx.com/jmc__V1.1.1.jar,http://dl.javafx.com/emptyJarFile-1242958365842__V1.1.1.jar" code="org.jdesktop.applet.util.JNLPAppletLauncher" mayscript="" height="200" width="200">
<param name="subapplet.classname" value="com.sun.javafx.runtime.adapter.Applet">
<param name="MainJavaFXScript" value="eggeral.splash.Main">