function tabSwitch(active, number, tab_prefix, midcontent_prefix) {

	for (var i=1; i < number+1; i++) {
	  document.getElementById(midcontent_prefix+i).style.display = 'none';
	  document.getElementById(tab_prefix+i).className = '';

	}
	document.getElementById(midcontent_prefix+active).style.display = 'block';
	document.getElementById(tab_prefix+active).className = 'active';	
	
}