var newWindow = null;

function openWindow(contentURL, windowName,windowWidth,windowHeight)  {

widthHeight = '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,widthtHeight);
newWindow.focus()
}

else {

newWindow.close();
newWindow = null;

}

}