function showSubmenu(menu){
	//hide all submenu
	document.getElementById('HRTSubmenu').style.height = '0px';
	document.getElementById('TollHSVSubmenu').style.height = '0px';
	document.getElementById('JDSubmenu').style.height = '0px';
	document.getElementById('HSVSubmenu').style.height = '0px';
	
	//show depanding on menu
	if(menu == 'HRT'){
		document.getElementById('HRTSubmenu').style.height = '100%';
	}else if(menu == 'TollHSV'){
	document.getElementById('TollHSVSubmenu').style.height = '100%';
	}else if(menu == 'JD'){
	document.getElementById('JDSubmenu').style.height = '100%';
	}else if(menu == 'HSV'){
	document.getElementById('HSVSubmenu').style.height = '100%';
	}
}