Abstract: Product information specifying products or services is received, each of the products or services being associated with an advertisement. Display criteria indicating display properties associated with the product information for displaying the product information, and one or more keywords are also received. The advertisement is identified in response to the one or more keywords. Advertisement display data for displaying the advertisement on the webpage is generated. Presentation data for displaying the product information according to the display properties separate from and proximate to the webpage is generated. The advertisement display data and the presentation data are provided to a client device.