How to disable dragging of image to the addressbar or tab in a page

hi friends

i want to disable dragging of imagesin my site to the addressbar or new tab, as we drag any image to the addressbar or new tab the whole site shows that image only..i mean the page shows that image ..so i donot want such type of functionality of dragging of images to the address bar/new tab,this type of problem is there in most of the sites,just try to drag the image from any site to the address bar/new tab ……..

Please any one knows the solution for this let me know the solution….

Thanks and regards

Ravishanker Maduri
Hyderabad.