problem with adapt in div

[manu0087]

hi, if a apply this js to an image in the div, this can t be resize with the div size.

wheelzoom(document.getElementById('idImg'), { zoom: 0.1, maxZoom: 10 });

<div style="position:relative;float: left;left:20px;align-items:center;text-align:center;width:100%;height:100%;_overflow:scroll" >    
        <asp:Image runat="server" ID="img_Table" style="width:100%;height:100%;"/> 
</div>