function showTab (tab) {
	// Array
	var tabs = new Array(
		'liste',
		'einfuegen',
		'bearbeiten'
	);
	
	// Set all invisible
	for (i=0;i<tabs.length;i++) {
		if (document.getElementById(tabs[i]) && document.getElementById('tab_'+tabs[i])) {
			if (document.getElementById(tabs[i]).style.display='block') {
				document.getElementById(tabs[i]).style.display='none';
			}
		
			if (document.getElementById('tab_'+tabs[i]).className='active') {
				document.getElementById('tab_'+tabs[i]).className='passive';
			}
		}
	};
	
	// Set display
	document.getElementById(tab).style.display='block';
	
	// Set style
	document.getElementById('tab_'+tab).className='active';
}

function closeElement(element) {
	document.getElementById(element).style.display='none';
}

function setDisplay (element) {
	var element_display = '';
	
	if (document.getElementById(element).style.display == 'none') {
		document.getElementById(element).style.display = 'block';
	} else if (document.getElementById(element).style.display == '') {
		document.getElementById(element).style.display = 'block';
	} else { 
		document.getElementById(element).style.display = 'none';
	}
}