// global variable
var newPopup;
function window_onunload() {
if (newPopup && !newPopup.closed) { // determine if popup is open
newPopup.close(); // close popup if window is closed or another page is accessed
}
}
function makePopup() {
if (newPopup && !newPopup.closed) {
newPopup.close(); // close popup if already open
}
var widthScreen = screen.availWidth;
var heightScreen = screen.availHeight;
var widthPopUp = 500;
var heightPopUp = 480;
var left = parseInt(widthScreen - widthPopUp) / 2;
var top = parseInt(heightScreen - heightPopUp) / 2;
var popupAttributes = "width=" + widthPopUp + ",height=" + heightPopUp;
popupAttributes += ",location=no,menubar=no,status=no,toolbar=no,";
popupAttributes += "directories=no,copyHistory=no,scrollbars=no,";
popupAttributes += "resizable=no,left=" + left + ",top=";
popupAttributes += top + ",screenX=" + left + ",screenY=" + top;
newPopup = window.open("", "Popup", popupAttributes); // open new window
newPopup.focus();
// create XHTML content for new popup
var popupContent = "KVHH Coverage Area";
popupContent += "";
popupContent += "![](\"../_images/site/coverage_area.gif\")
";
popupContent += "";
newPopup.document.write(popupContent); // write XHTML to new popup
}