var currentTab = 1;

function ChangeTab(tabNum) {
	//Reset all tabs:
	for(i =1; i <= 4; i++) {
		document.getElementById('tab' + i).className = 'tab';
		document.getElementById('containerTab' + i).style.display = 'none';
	}

	document.getElementById('tab' + tabNum).className = 'tab1';
	document.getElementById('containerTab' + tabNum).style.display = 'block';


}