The best example is for this ind of bug is presented by ryan as follows
http://www.ryancramer.com/misc/jquery_slide/#
the slide effects of jquery may not work 100% correctly in IE 6 & IE 7 . Effects are misbehave like effects complete till 50% or so...
So i have used show call back function to rescue the bug.. Though it is 100% not correct but once the effects renders second time it works perfectly.
So make it show and show it again..with less duration.. to avoid flickering effect.
$("my_element").show(1,function(){$(this).show("slide",{direction:"right"})})