var newWindow = null;
var isOpen = 0;

function popupWindow (source, oWidth, oHeight) {
	if (isOpen) {newWindow.close();}
	isOpen = 1;
	var windowSpecs;
	var windowWidth = oWidth + 50;
	var windowHeight = oHeight + 50;
	windowSpecs = 'width=' + windowWidth + ',height=' + windowHeight + 'status=0, resizable=1, scrollbars=0, titlebar=0, toolbar=0';
	newWindow = window.open(source, null, windowSpecs, false);
	newWindow.focus();
}