thickbox in a new window

[code]<a class="thickbox" href="viewgallery.php?uploadid=<?=$uploadid?>&keepThis=true&TB_iframe=true&height=537&width=493"><img src="<?=$imagedisplay?>" width="100" height="100"/></td>[/code]

I need that above linke pop up the viewgallery.php?uploadid=<?=$uploadid?> page into the new window ,and not in a same window.

any help?