The framework Ext JS can run on the IBM AS400 System-i over the PHP pre-processor with the databse DB2 or mySql and it is Cross-Browser.

• IBM AS400 or iSeries or i5 or System i 
• Operating system: V5R3+
• PHP Zend Core (free) - go to http://www.zend.com/en/products/platform/downloads and download/install Zend Core for i5/OS (if it's not already in your box). The install package also includes the MySql database.
• Ext JS - go to http://www.extjs.com and download/install Ext JS.
• db2web2 - web2 apps generator from db2 (recommended)

Client side (one of the following)

• Internet Explorer 6+
• FireFox 1.5+ (PC, Mac)
• Safari 3+
• Opera 9+ (PC, Mac)