parseing a document

Hi all
I am using vb6 and i am downloading a web page into a varible called my document. This i can do ok but i need to parse the data from the web page (now in my varible) so that i can check it for a particular string. Any ideas ??
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To find the position of string2 in string1 use:
instr(1,string1,string2)
The first parameter is the starting point.