function top_menu(menu_link) {
	if(menu_link == "menu_01") window.open('/html/en/intro/intro_01.html', '_self');
	if(menu_link == "menu_01_01") window.open('/html/en/intro/intro_01.html', '_self');
	if(menu_link == "menu_01_02") window.open('/html/en/intro/intro_02.html', '_self');
	if(menu_link == "menu_01_03") window.open('/html/en/intro/intro_03.html', '_self');
	if(menu_link == "menu_01_04") window.open('/html/en/intro/intro_04.html', '_self');
	if(menu_link == "menu_01_05") window.open('/html/en/intro/intro_05.html', '_self');
	if(menu_link == "menu_01_06") window.open('/html/en/intro/intro_06.html', '_self');
	if(menu_link == "menu_01_07") window.open('/html/en/intro/intro_07.html', '_self');
	
	if(menu_link == "menu_02") window.open('/html/en/college/college_01.html', '_self');
	if(menu_link == "menu_02_01") window.open('/html/en/college/college_01.html', '_self');
	if(menu_link == "menu_02_02") window.open('/html/en/college/college_02.html', '_self');
	if(menu_link == "menu_02_03") window.open('/html/en/college/college_03.html', '_self');
	
	if(menu_link == "menu_03") window.open('/html/en/school/school_01.html', '_self');
	if(menu_link == "menu_03_01") window.open('/html/en/school/school_01.html', '_self');
	if(menu_link == "menu_03_02") window.open('/html/en/school/school_02.html', '_self');
	if(menu_link == "menu_03_03") window.open('/html/en/school/school_03.html', '_self');
	
	//if(menu_link == "menu_04") window.open('/html/en/global/global_01.html', '_self');

	if(menu_link == "menu_05") window.open('/html/en/us/us_01.html', '_self');
}