var currentTab = 1;

function loadTab(id) {
	setDisplayEl('tab' + currentTab, 'none');
	changeLink('link' + currentTab, '');
	setDisplayEl('tab' + id, 'block');
	changeLink('link' + id, 'active');
	currentTab = id;
}

function setDisplayEl(id, value) {
	document.getElementById(id).style.display = value;
}

function changeLink(id, type) {
	document.getElementById(id).className = type;
}

function startupTabs() {
	i = 1;
	while(document.getElementById('tab' + i)) {
		if(i != currentTab) {
			setDisplayEl('tab' + i, 'none');
		}
		i++;
	}
}

startupTabs();