9. A computer program product, comprising one or more computer readable hardware storage devices having computer readable program code stored therein, said program code containing instructions executable by one or more processors of a computer system to implement a method, said method comprising: a first computer executing a plurality of text blocks of code derived from a script from a 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; and said first computer determining that the new text block includes malicious code and in response, said first computer preventing transmission of the web page to the client computer.
11. The computer program product of claim 9 , said method comprising: before said determining that the new text block includes malicious code, said first computer executing the new text block and copying the new text block to an output file in a data storage area.