navigation for nav #action

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C#

ASP.NET

I have code for opening menu named menu1.in that menu i have 2 items named menu11 & menu12.
I m facing one problem that when im clicking on menu11 or menu 12 after that the menu1 should be closed automatically.How it would be done?
nav #action-trigger
{
/*display: inline-block;
*display: inline;
*zoom: 1;
height: 25px;
line-height: 25px;
font-weight: bold;
padding: 0 8px;
text-decoration: none;
color: #FFFFFF;
text-shadow: 0 1px 0 #fff;
background-color:#666666;*/
display: inline-block;
display: inline;
zoom: 1;
height: 25px;
line-height: 25px;
font-weight: bold;
padding: 0 8px;
text-decoration: none;
color: #ffffff;
text-shadow: 0 1px 0 #fff;
background-color:#666666;
list-style-type:none;
}