function loginRegTab(tabNum) {
	logTab = document.getElementById('loginWindowTab');
	regTab = document.getElementById('regWindowTab');

	switch (tabNum) {
		case 0:
			logTab.style.cssText = "background: url('/images/elements/flipTab_log-in_on.gif') no-repeat top left;";
			regTab.style.cssText = "background: url('/images/elements/flipTab_sign-up_off.gif') no-repeat top left;";			
			hideDiv('regWindow');
			showDiv('loginWindow');
		break;
		case 1:
			logTab.style.cssText = "background: url('/images/elements/flipTab_log-in_off.gif') no-repeat top left;";
			regTab.style.cssText = "background: url('/images/elements/flipTab_sign-up_on.gif') no-repeat top left;";
			hideDiv('loginWindow');
			showDiv('regWindow');
		break;
	}
}
  
function showDiv(id){
	document.getElementById(id).style.display = 'block';
}

function hideDiv(id){
	document.getElementById(id).style.display = 'none';
}

if (document.images) {
	// set image url
	image_url = new Array();
	image_url[0] = "/images/elements/flipTab_log-in_on.gif";
	image_url[1] = "/images/elements/flipTab_log-in_off.gif";
	image_url[2] = "/images/elements/flipTab_sign-up_on.gif";
	image_url[3] = "/images/elements/flipTab_sign-up_off.gif";
	
	var myimages = new Array();
	for (var x = 0; x < image_url.length; x++) {
		myimages[x] = new Image();
		myimages[x].src = image_url[x];
	}
}