function mainmenu(){
	$(document).pngFix(); 
    $('ul.sf-menu').superfish({ 
        delay:       500,                            // 1/2 second delay on mouseout 
        animation:   {opacity:'show',height:'show'},  // fade-in and slide-down animation 
        speed:       'slow',                          // slow animation speed 
        autoArrows:  false,                           // disable generation of arrow mark-up 
        dropShadows: false                            // disable drop shadows 
    }); 
}