function showTabsreg(show) {
	var tabs = new Array("add-instructor","remove-instructor","view-instructors","textbooks","computing");
	for(i=0; i<tabs.length;i++) {
		if(tabs[i]!=show) {
			document.getElementById(tabs[i]).style.display = 'none';
			document.getElementById(tabs[i]+'-link').className = '';
		}
	}
	document.getElementById(show).style.display = 'block';
	document.getElementById(show+'-link').className = 'current';
	document.getElementById(show+'-link').blur();	
}