1. A method for determining whether a script from a web page includes malicious content, the method comprising: a first computer executing a plurality of text blocks of code derived from the script from the web page in response to a request for the web page from a client computer, said text blocks executed sequentially in a sequential order, wherein the script is a first text block of the plurality of text blocks, the execution of one text block of the plurality of text blocks by the first computer generating a new text block of code; the first computer copying each text block to an output file in a data storage area of the first computer, wherein the first text block is copied before another text block of the plurality of text blocks is copied; and after said copying each text block to the output file, the first computer determining that the new text block includes malicious code and in response, the first computer preventing transmission of the web page to the client computer.