Prototype problem + onload

Hello all from Sweden.

I’m working on a system in OOP Javascript. I have some big problems
with this prototype thing…

It’s really confusing. BTW, this is a Firefox only problem, none of the other browser are important for this system. Anyway this is what i got right now:

function sysInit() {
this.objDOMWindow = window;

// I believe this one is missplaced…
// If i remove it, the code run flawlessly without inheritance from mwas.
xreq.prototype = this;
}

window.onload = function () {
var mwas = new sysInit;
var mwasreq = new xreq();

// This is were my problem arise.
// In firefox the error says: mwasreq.send is not a function.
mwasreq.send();
}

function xreq(){
if(window.XMLHttpRequest) {
try {
this.req = new XMLHttpRequest();
} catch(e) {
return false;
}
}
}

xreq.prototype.send = function (){
// Works without xreq.prototype = this; in sysInit…
alert(this.req);

// Does not work! In any way…
alert(this.objDOMWindow);

}

Hope some OOP Javascript guru can help me out.

?

Best regards
Adrian

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