var newWindow
function makeNewWindow(aURL,aWidth,aHeight) {
  if(!newWindow || newWindow.closed) {
  	if(aHeight == null) {
		aHeight = 300;
	}
	
	if(aWidth == null) {
		aWidth= 450;
	}
	
    newWindow=window.open(aURL,"","height="+ aHeight +",width=" + aWidth+",alwaysRaised=yes,resizable=no,toolbar=no,scrollbars=no,status=no,copyhistory=no,menubar=no,location=no");
	
	if(!newWindow.opener) {
	  newWindow.opener=window;
	}
  } else {
    newWindow.location=aURL;
    newWindow.focus();
  }
}