1. A method for modifying a search engine, comprising: a computer server creating a search engine for a website, wherein said creating the search engine comprises creating search information for a plurality of webpages of the web site, wherein the search information specifies a first set of information for each webpage; the computer server providing a search-customization user interface for modifying a ranking function of the search engine for the website, wherein the search-customization user interface specifies one or more first ranking factors; after the user inserts one or more first custom tags into source code of at least one webpage of the web site, the computer server updating the search information to include information related to the one or more custom tags, wherein the one or more custom tags are dedicated for customizing the search engine of the website; the computer server providing the search-customization user interface for modifying the ranking function of the search engine for the website, wherein, in addition to the one or more first ranking factors, the search-customization user interface specifies one or more additional ranking factors corresponding to the one or more first custom tags, wherein each additional ranking factor is added to the search-customization user interface for a respective first custom tag inserted into the source code; the computer server receiving first user input from the user, wherein the first user input specifies modifying a relative weight of a first additional ranking factor of the one or more additional ranking factors; the computer server automatically modifying the ranking function of the search engine to use the relative weight of the first additional ranking factor based on the first user input; after automatically modifying the ranking function of the search engine to use the relative weight of the first additional ranking factor, the computer server receiving a search query for the website; and the computer server providing a plurality of search results using the ranking function.
1. A method for modifying a search engine, comprising: a computer server creating a search engine for a website, wherein said creating the search engine comprises creating search information for a plurality of webpages of the web site, wherein the search information specifies a first set of information for each webpage; the computer server providing a search-customization user interface for modifying a ranking function of the search engine for the website, wherein the search-customization user interface specifies one or more first ranking factors; after the user inserts one or more first custom tags into source code of at least one webpage of the web site, the computer server updating the search information to include information related to the one or more custom tags, wherein the one or more custom tags are dedicated for customizing the search engine of the website; the computer server providing the search-customization user interface for modifying the ranking function of the search engine for the website, wherein, in addition to the one or more first ranking factors, the search-customization user interface specifies one or more additional ranking factors corresponding to the one or more first custom tags, wherein each additional ranking factor is added to the search-customization user interface for a respective first custom tag inserted into the source code; the computer server receiving first user input from the user, wherein the first user input specifies modifying a relative weight of a first additional ranking factor of the one or more additional ranking factors; the computer server automatically modifying the ranking function of the search engine to use the relative weight of the first additional ranking factor based on the first user input; after automatically modifying the ranking function of the search engine to use the relative weight of the first additional ranking factor, the computer server receiving a search query for the website; and the computer server providing a plurality of search results using the ranking function. 7. The method of claim 1 , wherein creating the search information for the plurality of webpages comprises creating a document comprising the search information for each webpage.