Tomcat 5.0.19, JRE 1.5.0 and Jasper Exeception

I am trying to help someone solve a jsp problem, but while I am not computer stupid I just really don't know anything about jsp. Here is the summary:
They had a website running using Tomcat 5.0.19 and JRE 1.5.0. They edited their index.jsp page using Macromedia Dreamweaver MX and now are getting the following error:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: -1 in the jsp file: null
Generated servlet error:
[javac] Compiling 1 source file
C:\Tomcat 5.0\work\Catalina\domain\_\org\apache\jsp\script\index_jsp.java:7: cannot access java.lang.Object
bad class file: C:\Program Files\Java\jre1.5.0_02\lib\rt.jar(java/lang/Object.class)
class file has wrong version 49.0, should be 48.0
Please remove or make sure it appears in the correct subdirectory of the classpath.
public final class index_jsp extends org.apache.jasper.runtime.HttpJspBase
^
1 error
     org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:127)
     org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:351)
     org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:415)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:458)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:553)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:291)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
I found several posts about "class file has wrong version 49.0, should be 48.0" on the net, but none of the solutions seemed to fit with our problem. Thanks in advance for any help that can be provided.

This means you are using the 1.4 JVM with 1.5 libraries.
Make sure Java is installed correctly. BTW: try 1.5.0_04

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