Anchor tag is missing after changing image through cms

[jrkishore4u]

I copied html file to get simple cms 3.1.2 firefox version...the anchor tag contains img tag under it...i have used anchor tag outside img tag for purpose of zooming image, once i change image through cms, the anchor tag is missing and zoom functionality is not working.......

Same problem is arising if i used <div> or <span> or <p> tag inside <a> tag..

i have attached screen shots before changing and after changing images...

please help me out