function show(menu) {
	
	if(menu == 'main') {
		document.getElementById('main_selected').style.display = 'none' ;
		document.getElementById('main_entries').style.display = 'block' ;
		document.getElementById('menu_sub').style.display = 'none' ;
	}
	if(menu == 'sub') {
		document.getElementById('sub_selected').style.display = 'none' ;
		
			document.getElementById('sub_entries').style.display = 'block' ;
	
			document.getElementById('sub_container').style.display = 'block' ;
		
		
		if (window.innerHeight) {
		    height = window.innerHeight - 200;
		}
		if (document.body && document.body.offsetHeight) {
		    height =  document.body.offsetHeight - 200;
		}
	

		document.getElementById('sub_container').style.height = height + 'px' ;
	
			/*not IE*/
		if (window.innerWidth) {
			document.getElementById('sub_container').style.width = 204 + 'px' ;
		}
		
		
		
		
		
		document.getElementById('sub_container').style.overflow = 'auto' ;
	
	}
	if(menu == 'contact') {
		document.getElementById('logo_pic').style.display = 'none' ;
		document.getElementById('menu_main').style.display = 'none' ;
		document.getElementById('menu_sub').style.display = 'none' ;
		document.getElementById('contact').style.display = 'block' ;
	}
	
}

function hide(menu) {
	
	if(menu == 'main') {
		document.getElementById('menu_sub').style.display = 'block' ;
		document.getElementById('main_selected').style.display = 'block' ;
		document.getElementById('main_entries').style.display = 'none' ;
	}
	if(menu == 'sub') {
		document.getElementById('sub_selected').style.display = 'block' ;
		if(window.devicePixelRatio) {
			document.getElementById('sub_entries').style.display = 'none' ;
			document.getElementById('sub_container').style.width = 189 + 'px' ;
			document.getElementById('sub_container').style.height = 32 + 'px' ;
		}
		else {
			document.getElementById('sub_container').style.display = 'none' ;
		}
		
			
			
	}
	if(menu == 'contact') {
		document.getElementById('contact').style.display = 'none' ;
		document.getElementById('logo_pic').style.display = 'block' ;
		document.getElementById('menu_main').style.display = 'block' ;
		document.getElementById('menu_sub').style.display = 'block' ;
	}
}