MSCRM 2011 Javascript Premissions Denied Issue

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Javascript

webservice

CRM

I'm currently facing an issue calling our own built webservice from mscrm form onload javascript event, all I get is a permission denied here is my javascript and more details, the same javascript code if I run it from a asp.net website I get my data back, I'm only getting the permissions denied error if I put this Jscript on MSCRM form. I tried with calling with a relative path like (x.y.z/WebService.asmx and /WebService.asmx)in that case I get a resource not found error. Your help is highly appreciated

function GetRMSBillDetails() {
           // var oDataEndpointUrl = "/WebService.asmx";

            var oDataEndpointUrl = "http://x.y.com:8082/abc.asmx";
            //var oDataEndpointUrl  = "http://x.y.com/abc/GetBillsFromRMSService";
            var xmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");

            if (xmlHttpRequest != null) {

                var xml = "";
                xml += "";
                xml += "<soap:body xmlns:soap="#unknown">"
                xml += ""
                xml += "</soap:body>"
                xml += "";

                xmlHttpRequest.Open("POST", oDataEndpointUrl, true);
                xmlHttpRequest.setRequestHeader("SOAPAction", "https://x.y.com/xyz/GetBillsFromRMSService");
                xmlHttpRequest.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
                xmlHttpRequest.setRequestHeader("Content-Length", xml.length);
                xmlHttpRequest.send(xml);
                 alert("XML " +  xmlHttpRequest.responseXml);
                 
                }

            }
            return false;
        }