how to make https post in JavaScript

hello ranchers
I am trying to connect to an url which is on https, i am fine with the http post in java script using XmlHttpRequest, but i am unable to make a https post using the same.
Actually the java script is a part of the Phonegap which is no way different from how the java script being handled in a browser.
One more question i have is, how to provide the security certificate in order to make the https communication.
Can any one please provide me with the piece of code to make the https post.

You can not make XMLHttpRequest calls from http to https and https to http because of the same origin policy.

Eric

Thanks for the reply Eric

You can not make XMLHttpRequest calls from http to https and https to http because of the same origin policy.

I am not making the call from http to https or vice versa, my requests and responses are to https only.

I have noticed like my post has been edited, i am sorry if some thing what i mean to say didn't make any sense but the content of the post which has been modified is

Bear Bibeault edited it as wrote: but i am unable to make a http post using the same.

but i am facing the problem in making https post, i am not sure whether XmlHttpRequest is to be used for a https post, please correct me if i am wrong, but what i need is to make a https post, so i restored the content of the post i made here as

but i am unable to make a https post using the same.

Is there error messages? Using a tool such as Fiddler do you see the call go out?

Eric