window.onload = init;

function init() {
	addIndexAction();
	addRollover();
}

function addIndexAction() {
	toc = document.getElementById('menuTab');
	if(!toc) return;
	indexListItems = document.getElementById('menuTab').getElementsByTagName('li');
	indexListItems[0].getElementsByTagName('a')[0].onclick = function() { showTab(1) };
	indexListItems[1].getElementsByTagName('a')[0].onclick = function() { showTab(2) };
	indexListItems[2].getElementsByTagName('a')[0].onclick = function() { showTab(3) };
}

function showTab(nTip) {
	for(n=1; n<=3; n++) {
		document.getElementById('menu'+n).className = 'content p2 hide';
	}
	document.getElementById('menu'+nTip).className = 'content p2';
}

function addRollover() {
	if(!document.getElementById('download')) return;
   	document.getElementById('down1').onmouseover = function() { showImg(1) };
	document.getElementById('down2').onmouseover = function() { showImg(2) };
	document.getElementById('down3').onmouseover = function() { showImg(3) };
}

function showImg(nImg) {
	document.getElementById('rollSide').src = 'img/upload/download_rollover_'+nImg+'.png';
}