I actually tried this by uploading the file in the document library on the home page and then giving that path on the link.
But when I used to enter the site by just typing the username and password it never used to display the image on the home page, then i tried typing this
Then it started displaying the picture on the home page. But yet your solution worked by copying the image on the document folder.
Thank You Once again .
But I do have few more doubts on this. I will open one more question on folder restrictions(SharePoint Portal) hope you could give a solution on this as well. I will open it right away.