Hi, i have asp button like this: <asp:Button ID="ImportToDB" runat="server" OnClick="ImportToDB_Click" /> And i need to call a javascript function when mouseover on this button. So i have in page_load(): ImportToDB.Attributes.Add("onmouseover","javascript:OnButtonMove(" + ImportToDB.ClientID + ")"); javascript function: <script language="JavaScript" type="text/javascript"> function OnButtonMove(id) { //something } </script> Everithing work fine only if button is enabled. but when i disable button, this javascript function will never fire. what i am trying to do: I have button and when is something wrong i just disable it. And when user mouseover this(disable) button, I show him DIV with a message. Can someone tell me why i cannot call this JS function while button is disabled?