Error deploying images on SSRS 2008 R2

Hi,

I have problem while deploying Resouce i.e. images on report server. Here I am using a VB script using ReportingService 2010 endpoint which uses the createcatelogitem() method for deploying images. My Function Body is

rs.CreateCatalogItem("Resource","Image1","ReportServer/Resources,True,Defination,Nothing, "image/jpeg", Nothing)

but it giving me the error :

Microsoft.ReportingServices.Diagnostics.Utilities.MissingRequiredPropertyForItemTypeException: The value for property 'MimeType' is not specified. The property is either missing or its value is null.

  at Microsoft.ReportingServices.WebServer.ReportingService2010.CreateCatalogItem(String ItemType, String Name, String Parent, Boolean Overwrite, Byte[] Definition, Property[] Properties, Warning[]& Warnings)

Please Help.

Thanks