Error message

• Notice: Undefined variable: base_url in eval() (line 13 of /home/fral/public_html/modules/php/php.module(80) : eval()'d code).
• Notice: Undefined variable: base_url in eval() (line 15 of /home/fral/public_html/modules/php/php.module(80) : eval()'d code).
• Notice: Undefined variable: base_url in eval() (line 17 of /home/fral/public_html/modules/php/php.module(80) : eval()'d code).