Getting html source of a file?

[harpo]

Hi,

This question is not exactly related to Script Builder, please excuse me
for that.
I'm making a html file for offline use and I want to be able to open
another .html files ( from local HDD only ) and to assign their source
code to a string variable.
If i put this in my file
<input type="file" name="myfile">
it creates a Browse button which allows you to select a file from a HDD.

I want if the selected file is .html , to assign its source code to a
string variable which i can use later on.
Is that possible?

Thanks for any help