var intCurrentTab = 1;
var intPreviousTab = null;

function setTabContent(whichTab) {
	if (intPreviousTab != null) {
		document.getElementById("link" + (intPreviousTab + 1)).className = "";
	}
	intPreviousTab = intCurrentTab;
	intCurrentTab = whichTab;
	document.getElementById("link" + (whichTab + 1)).className = "";
	document.getElementById("link" + (whichTab + 1)).className+="on";
	if (intCurrentTab != intPreviousTab) {
		document.getElementById("link" + (intPreviousTab + 1)).className = "";
	}

}