Haaaaaa quindi non vuoi la position absolute ma relative!!

<div id="Layer1" style="position:relative; width:200px; height:0px; z-index:1; visibility: hidden; top: 314px; left: 117px;" onMouseOver="MM_showHideLayers('Layer1','','show') " onMouseOut="MM_showHideLayers('Layer1','','hide')" >


prova ora