function showmenu(elmnt)
{
    if( document.getElementById(elmnt) != null)
    {       
        document.getElementById(elmnt).style.visibility="visible"; 

        // hide select elements
        var myForm = document.forms[0];
        if(myForm!=null && myForm.elements!=null)
        {
            for (var i=0; i < myForm.elements.length; i++) 
            {
                var myElement = myForm.elements[i];
                var myType = myElement.type;
                if (myType == 'select-one' || myType == 'select-multiple')
                    myElement.style.visibility="hidden";
            }
        }
    }
}

function hidemenu(elmnt)
{
    if( document.getElementById(elmnt) != null)
    {
	document.getElementById(elmnt).style.visibility="hidden";
    }

    // hide select elements
    var myForm = document.forms[0];
    if(myForm!=null && myForm.elements!=null)
    {
        for (var i=0; i < myForm.elements.length; i++) 
        {
            var myElement = myForm.elements[i];
            var myType = myElement.type;
            if (myType == 'select-one' || myType == 'select-multiple')
                myElement.style.visibility="visible";
        }
    }
}