How do I set the classpath in runtime?

How can i set the classpath in runtime?
Im downloading my image files in the folder C:/Downloads
I want to set this C:/Downloads as my classpath.
I don want to set it at the initial stage, bcoz I may have to change the downloading directory D:/Selva.
I want to access my */utils/New.gif* image available in the downloading directory by using getResource() method.

java.net.URL urldir= new java.net.URL("file://C:/Downloads/");
java.net.URL[] urlarr= new java.net.URL[1];
urlarr[0]=urldir;
java.net.URLClassLoader urlcl= new java.net.URLClassLoader(urlarr); +// Here I get the Error+
url=urlcl.getResource("/lrp/utils/New.gif");
*Error: java.security.AccessControlException: access denied (java.lang.RuntimePermission createClassLoader+

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java.net.URL urldir= new java.net.URL("file://C:/Downloads/");
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