<asp:LinkButton id="lbnkVidTtile1" runat="Server"  
    CssClass="bodytext" Text="Email"
    OnClientClick="return PostToNewWindow();"  /> 
 
<script type="text/javascript"> 
function PostToNewWindow() 
{ 
    originalTarget = document.forms[0].target; 
    document.forms[0].target='_blank'; 
    window.setTimeout("document.forms[0].target=originalTarget;",300); 
    return true; 
} 
</script>