Update Entity image issue

Hi,

i want to change entity image according to status field if status value is "1", image1 name "new_image1.jpg" will display and if status value is "2" then image2 name "new_image2.jpg" will display

i have an entity name "new_dealer" with optionset field name "new_status"

i have added two images as web resource "new_image1.jpg" , "new_image2.jpg"

These are steps which i followed according to your instructions

first of all i added a web resource as javascript file name "new_setImageMethods"

//Hook this method to the "OnChange" event of "new_status" field
function OnAttributeChange_Status() {
 
    var dealerId = Xrm.Page.data.entity.getId();
    var statusValue = Xrm.Page.getAttribute("new_status").getValue();
 
    if (statusValue == 1)
    {
         //retrieve image new_image1.jpg and update dealer record "EntityImage" attribute
        this.UpdateDealerRecordWithNewImage(dealerId, "new_image1.jpg");
 
    }
    else if (statusValue == 2)
    {
         //retrieve image new_image2.jpg and update dealer record "EntityImage" attribute
        this.UpdateDealerRecordWithNewImage(dealerId, "new_image2.jpg");
 
    }
}

function UpdateDealerRecordWithNewImage(dealerId, webResourceName){
 
    this.GetImageWebResource(
        dealerId,
        webResourceName,
        this.UpdateDealerRecord
    );
 
}

function GetImageWebResource(dealerId, imageName, successCallback) {
 
    //OData URI to get address information from parent account record
    var oDataURI = Xrm.Page.context.getClientUrl()
        + "/XRMServices/2011/OrganizationData.svc/"
        + "WebResourceSet"
        + "?$filter="
        + "Name eq '" + imageName + "'"
        + "&$select=Name,Content";
 
    //Synchronous XMLHttpRequest to retrieve account record
    var req = new XMLHttpRequest();
    req.open("GET", encodeURI(oDataURI), false);
    req.setRequestHeader("Accept", "application/json");
    req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
    req.onreadystatechange = function () {
        //debugger;
        if (this.readyState == 4 /* complete */) {
            req.onreadystatechange = null; //avoids memory leaks
            if (this.status == 200) {
                //parse the response string as a JSON object into the successCallback method.
                successCallback(dealerId, JSON.parse(this.responseText).d);
            }
            else {
                var errorMsg1 = "GetImageWebResource Error: cannot retrieve image with name = " + imageName + ".";
                //display a non-blocking alert dialog
                Xrm.Utility.alertDialog(errorMsg1, function () { });
            }
        }
    };
    req.send();
}

function UpdateDealerRecord(recordId, webResource) {
 
    var new_dealer = {};
    new_dealer.EntityImage = webResource.results[0].Content; //byte[] content of the web resource
 
    var jsonDealer = JSON.stringify(new_dealer);
 
    //OData URI
    var oDataURI = Xrm.Page.context.getClientUrl()
        + "/XRMServices/2011/OrganizationData.svc/"
        + "new_dealertSet(guid'" + recordId + "')";
 
    //Synchronous post
    var req = new XMLHttpRequest();
    req.open("POST", encodeURI(oDataURI), false);
    req.setRequestHeader("Accept", "application/json");
    req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
    req.setRequestHeader("X-HTTP-Method", "MERGE");
    req.onreadystatechange = function () {
        //debugger;
        if (this.readyState == 4 /* complete */) {
            req.onreadystatechange = null;
            if (this.status == 204 || this.status == 1223) {
                //reloads the dealer record
                window.location.reload(false);
            }
            else {
                var errorMsg2 = "UpdateDealerRecord Error: Cannot update dealer record with dealerId = " + recordId + ".";
                //display a non-blocking alert dialog
                Xrm.Utility.alertDialog(errorMsg2, function () { });
            }
        }
    };
    req.send(jsonDealer);
}

I call this function "OnAttributeChange_Status" onchange event of status field but still i got an error

here is error:

Microsoft Dynamics CRM Error Report Contents

<CrmScriptErrorReport>
  <ReportVersion>1.0</ReportVersion>
  <ScriptErrorDetails>
   <Message>Unable to get property 'Content' of undefined or null reference</Message>
   <Line>67</Line>
   <URL>/%7B635300259790000809%7D/WebResources/new_updateimage</URL>
   <PageURL>/main.aspx?etc=10010&extraqs=%3f_gridType%3d10010%26etc%3d10010%26id%3d%257bCC7A88A6-14A8-E311-940F-002564C04E9E%257d%26rskey%3d422667900&pagemode=iframe&pagetype=entityrecord&rskey=422667900</PageURL>
   <Function>UpdateDealerRecord(recordId,webResource)</Function>
   <CallStack>
    <Function>UpdateDealerRecord(recordId,webResource)</Function>
   </CallStack>
  </ScriptErrorDetails>
  <ClientInformation>
   <BrowserUserAgent>Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0; .NET4.0E; .NET4.0C; .NET CLR 3.5.30729; .NET CLR 2.0.50727; .NET CLR 3.0.30729)</BrowserUserAgent>
   <BrowserLanguage>en-US</BrowserLanguage>
   <SystemLanguage>en-US</SystemLanguage>
   <UserLanguage>en-US</UserLanguage>
   <ScreenResolution>1280x800</ScreenResolution>
   <ClientName>Web</ClientName>
   <ClientTime>2014-03-09T22:29:24</ClientTime>
  </ClientInformation>
  <ServerInformation>
    <OrgLanguage>1033</OrgLanguage>
    <OrgCulture>1033</OrgCulture>
    <UserLanguage>1033</UserLanguage>
    <UserCulture>1033</UserCulture>
    <OrgID>{9271BA52-3892-E311-93F4-002564C04E9E}</OrgID>
    <UserID>{9D4AB36C-3892-E311-93F4-002564C04E9E}</UserID>
    <CRMVersion>6.0.0.809</CRMVersion>
  </ServerInformation>
</CrmScriptErrorReport>

Please tell me what should I do for resolve this issue?