how to find placed or linked image mode

HI anyone please help me to find placed or raster image mode

i tried with below code but i couldn't find

here is my code

if (sel[i].typename == "PlacedItem"||"rasterItem")

                        {

                            var iplaced = sel[i];

                           iplaced.fileType = file;and iplaced.fileMODE = file;//i tried with the following code but i i oculdent get

                            alert(file);

                         }

Please ant one help me

Thanks

APPU