IE 8 - mouse over an img affects ul

[sweety_vbulletin3_import9520]

\[code\]<div><ul class="ulCont"><li><a href="http://stackoverflow.com/questions/13867338/#nogo">Sky</a></li><li><a href="http://stackoverflow.com/questions/13867338/#nogo">Sea</a></li></ul><img class="thinker01" src="http://stackoverflow.com/questions/13867338/images/thinker01.png"/><div class="clearBoth"></div></div>\[/code\]CSS \[code\].ulCont{float:left;}.thinker01{float:right;}.thinker01:hover{margin-top:-5px;}.clearBoth{clear:both;}\[/code\]Firefoks and Chrome - works well, i.e. \[code\]img\[/code\] is moved on mouseover, and \[code\]ul\[/code\] stays in place.
IE8 - when mouseover \[code\]img\[/code\] - it also moves \[code\]ul\[/code\] up to -5px top margin.
So, could someone set an embargo on IE production ?