Getting additional images pop up in thickbox

Basically what I am trying to do is… I have a page with an image, then have additional images under it. I am trying to get the additional image to pop up in a thickbox.

Heres what I have

echo "<a href=\\"UImages/$Image\\"><img src=\\"UImages/$Image\\" width=\\"75\\" height=\\"75\\" alt=\\"Thumb\\" class=\\"thickbox\\"> </a>";

So far all it is doing is popping up in a new window.

Any suggestions?

EIDT: Got it fixed

echo "<a href=\\"UImages/$Image\\" class=\\"thickbox\\"><img src=\\"UImages/$Image\\" width=\\"75\\" height=\\"75\\" alt=\\"Thumb\\" > </a>";