Pop up window in Product Configuration Screen for particular value selected

Hi

We are using E Commerce ISA 5.0 with ECC.

For the B2B B2C Application, in the product configuration screen, we need to show the pop up window depending on the value selected in the drop down for particular property.

The inputs field are either drop down, radio button or input text fields.

Please can someone tell, which JSP files need to be modified to include these pop up messages.

Thanks