Facing a certain issue on internet explorer while custom integrating skipjack with salesforce.

1.       On posting a visual force page form from IE 6.0 to https://developer.skipjackic.com/scripts/evolvcc.dll?AuthorizeAPI" we get “Permission Denied” error

2.       On Posting a form from Firefox 2.0.0.12/Mozilla the same form gets posted but with a popup to Allow or Deny the form post .

3.       The function PostForm(sVars) below is called on a button click which sends the request through an XMLHttpRequest call to the sjipjack server

The error on IE is due to a cross domain call by the XMLHttpRequest object on line xmlHttp.open("POST",url,false);

4.        

The javascript code inside the form that makes this work is

<script src="/soap/ajax/8.0/connection.js"></script>

<script src="/soap/ajax/8.0/apex.js"></script>

<script language="javascript" type="text/javascript">

//make call to skipjack server through xmlHttpRequest object

function PostForm(sVars)

{

 xmlHttp=GetXmlHttpObject();

if (xmlHttp==null)

{

    alert ("Your browser does not support AJAX!");

    return;

}

var url="https://developer.skipjackic.com/scripts/evolvcc.dll?AuthorizeAPI";

alert(sVars);

alert("beforesent");

xmlHttp.onreadystatechange=stateChanged;

//check browser

var IE = document.all?true:false

// If NS -- that is, !IE -- then set call netscape.security

if (!IE)

{

    netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");

}

xmlHttp.open("POST",url,false);

xmlHttp.setRequestHeader("Content-Type",

          "application/x-www-form-urlencoded");

xmlHttp.send(sVars);

alert("sent");

}

function GetXmlHttpObject()

{  

    var xr=null;

    if(window.XMLHttpRequest) //if browser is mozilla/firefox

    {

        try

        {

            xr=new XMLHttpRequest();

        }

        catch(e){alert(xr);

        }

    }

    Else //if browser is IE

    {

        if(window.ActiveXObject)

        {

            try

            {

            xr=new ActiveXObject("Microsoft.XMLHTTP");

            }

            catch(e)

            {

            }

            if(!xr)

            {

                try

                {

                xr=new ActiveXObject("Msxml2.XMLHTTP");

                }

                catch(e)

                {

                }

            }

        }

    }

    return xr;

}

</script>