So this is 2 questions?

What I'm gonna do is this:

> 
> User can modify the elements on the
> page,and after modifying he can save
> the changes,and next time when he
> opens the page,it's like when he saved
> it.
> 
> 
> 

It's a little similar to <http://www.google.com/ig>,which saves your change when placing the widgets.
And I've found it'll send requests like `http://www.google.com/ig/setp?et=4b20aa66V7sx6KZ1&mp=2_1%3A1_2%3A11_2%3A10_2%3A9_2%3A3_2%3A4_2%3A5_2%3A6_2%3A_opt_3%3A7_3` each time you place the widgets,but I can't decipher what it means.

11\_1:1\_1:2\_1:10\_2:9\_2:3\_2:4\_2:5\_2:6\_2:\_opt\_3:7\_3 is what that url contains after `urldecode`,can someone guess out the meaning of it?