Drop down menu not hiding

See more:

ASP.NET

Hi,

I am populating a menu control from database in my page load event. In my page load event I am using a JavaScript to hide the menu. And in one image link mouse hover I am calling one more JavaScript function to make it visible.

My problem is my menu is not hiding automatically in mouse out.


My Menu:

<asp:Menu ID="mnuProject" runat="server"
        onmenuitemclick="mnuProject_MenuItemClick" Style="z-index: 200; left: 1200px;
           position: absolute; top: 97px"

                    DynamicHorizontalOffset="2"
                    MaximumDynamicDisplayLevels="6";
                    StaticSubMenuIndent="10px"

                    Height="0px"
                    StaticMenuItemStyle-CssClass="menuItemA"
                    DynamicMenuItemStyle-CssClass="subMenuItemA"
                    DynamicHoverStyle-CssClass="subMenuItem_selectedA">

CSS:

.menuItemA
{
    font-family: Arial;
    font-size: small;
    color: White;
    background-attachment: scroll;
    background-image:url('../Images/small-bar.png');
}

.subMenuItemA
{
    font-family: Arial;
    font-size: small;
    color: Navy;
    background-attachment: scroll;
    background-image: url("../Images/Menu subitem background silver.png");
    padding-top: 5px;
    padding-bottom:5px;
}
.subMenuItem_selectedA
{
    font-family: Arial;
    font-size: small;
    color: Blue;
    padding-top: 5px;
}

Load event code:

 mnuProject.Items.Clear();
        DataSet ds = master.SelectProjectDetails();
        Menu menu = new Menu();
        foreach (DataRow parentItem in ds.Tables[0].Rows)
        {
            MenuItem categoryItem = new MenuItem((string)parentItem["ProjectName"]);
            mnuProject.Items.Add(categoryItem);
        } 

mnuProject.Attributes.Add("style", "visibility:hidden;z-index: 200; left: 1200px; position: absolute; top: 97px");

To make it visible:
In some image mousehover :

function showProject() {
    document.getElementById('mnuProject').style.visibility = 'visible';
}

Please solve my problem guys.