function si_onload() {	
	SI_menu('nav-main','nav-const'); // ,'nav-sub'
	alternate('alts');
}
function addLoadEvent(func)
{	
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;
	} else {
		window.onload = function(){
		oldonload();
		func();
		}
	}
}
addLoadEvent(si_onload);