Php help

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Experience Level: Intermediate
i'm teaching myself php for a project, i also am using dreamweaver cs3. simple things need help.
1) i want to be able to go back to the same page that i started from with a button, like websites \"back arrow at top left\". Example, i have 3 different forms that can link to the same online 4th form, depending on what form sent me to form4 i want to go back to that same page.
2) i always seem to get an undefined index when i use $_POST['something'] on the receiving page. i can print_r the value on the receiving page but i can't use it. i've used dreamweaver's form variable and i also tried making a script for testing & still the same thing. i must be doing something wrong but can't figure out what it is.
how much will your advise cost and how soon since i'm in a hurry (like everyone, smile)
thank you

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