A question on finding data with PHP3

[Anon]

Hello,
I'm completely new to PHP3 and have to ask for help.Working with a project,I find a function in the source code of web page:
function LoadFeedback() {
var URL = "feedback.php3" ;

	esdc=document.datasource ;
	URL += "?_Title="                  + escape( esdc.getTitle()                ) ;
	URL += "&_Units="                  + escape( esdc.getUnits()                ) ;
	URL += "&_Case="                   + escape( esdc.getCase()                 ) ;
	URL += "&_Max_Load="               + escape( esdc.getMaxLoad()              ) ;
	URL += "&_Max_Length="             + escape( esdc.getMaxLength()            ) ;
	URL += "&_Min_Load="               + escape( esdc.getMinLoad()              ) ;

	var msgWindow=window.open( URL,"m","innerWidth=750,innerHeight=900,location=no,menubar=no,resizable=yes,scrollbars=yes" ) ;
}

And the author then created a feedback.php3 file to feedback what the user's input from a Java applet interface ,and the feedback form included all the values like Title,Maxload....all the things shown above.
I wonder how does the web page get the data of these values? I'm sure only this LoadFeedback function is related to this.But when I downloaded this webpage to my local drive,I saw the web page couldn't get the data anymore.Why?
Any help is appreciated,and I just need this function badly.my email:[e-mail]