Customization of PAR

Hi Experts,

If i have created a user wothout any roles in Portal we will get a page like "no portal roles are assigned to the user ,Contact Sys Admin".I want to customize this page by adding some html page .I got the PAR file which i have to customize which is com.sap.portal.navigation.portallauncher.par file. Can any one please let me know how to add a html page in this par file.

Regards

Alexi