function divSwitch (hideDiv,showDiv) {
	// exit point for older browsers
	if (!document.getElementsByTagName) {return null;}
	// hide divs
	hideWhat = document.getElementById(hideDiv);
	hideWhat.style.display = "none";
	// show div
	showWhat = document.getElementById(showDiv);
	showWhat.style.display = "block";
	// end function
	return;
	}