function tabSwitch(active, number, tab_prefix, content_prefix, on, off) {
	for (var i=1; i <= number; i++) {
		document.getElementById(content_prefix+i).style.display = 'none';
		document.getElementById(tab_prefix+i).className = 'tab '+off;
	}
	
	document.getElementById(content_prefix+active).style.display = 'block';
	document.getElementById(tab_prefix+active).className = 'tab tab_active '+on ;	
}