Php+ajax related issues

Php+ajax problems
This code is PHP plus ajax, when I click on the hyperlink is not to show the effect, which man can point out the problem AH



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Two errors
The function funphp100 (var url) parameter does not have to add Var declaration, as for why I do not understand
Xmlhttp.send (NULL); A variable is case-sensitive and XMLHTTP is considered another variable.
With this error, most browsers will report why they are wrong and recommend Chrome. And you don't have to worry about looking for a sentence.
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There were a few minor mistakes, changed. Compare yourself



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Do Ajax, suggest using jquery plugin bar, pure JS code is too troublesome, very prone to error.
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Do Ajax, suggest using jquery plugin bar, pure JS code is too troublesome, very prone to error.

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