The CFERROR tag is great to customize the default error template. It is used to display a standard HTML page when errors occur. The tag takes three parameters: template (which refers to the template in which you want to display your errormessage) and mailto (the e-mail address of the webmaster for example.
There's two error Type it can handle: Request (which refers to the processing of the page) and Validation
The tag usually is placed within the application.cfm page, that's also the template to place error-handling code for Validation error-types.
For more info, read the manual, I'm sure it will help. <webguru>iqof188</webguru>