var newWindow = null;

function openWindow(contentURL,windowName,windowHeight,windowWidth) {widthHeight = 'scrollbars=yes,resizable=yes,height=' + 
	windowHeight + ',width=' + windowWidth;
	newWindow = window.open(contentURL,windowName,widthHeight); newWindow.focus()}

function closeWindow() {

	if (newWindow != null)  {
		 newWindow.close();
		 newWindow = null;}
		 }

function toggleWindow(contentURL,windowName,windowWidth,windowHeight) {
	if (newWindow == null) {
		widthHeight = 'HEIGHT=' + windowHeight + ',WIDTH=' + windowWidth;
		newWindow = window.open(contentURL,windowName,widthHeight);
		newWindow.focus()
	}
	else {	
	 			newWindow.close();
	 			newWindow = null;
	}
}