//Global variables
var popWin = null;


//Function for the Query Pop-up Windows
function openWin(winURL, winWidth, winHeight, winFeatures, winLeft, winTop){
  var d_winLeft = 650  // default, pixels from screen left to window left
  var d_winTop = 400   // default, pixels from screen top to window top
  var winName = "popWin"
  closePopWin()           // close any previously opened pop-up window
  if (openWin.arguments.length >= 4)  // any additional features? 
    winFeatures = "," + winFeatures
  else 
    winFeatures = "" 
  if (openWin.arguments.length == 6)  // location specified
    winFeatures += getLocation(winWidth, winHeight, winLeft, winTop)
  else
    winFeatures += getLocation(winWidth, winHeight, d_winLeft, d_winTop)
    popWin = window.open(winURL, winName, "width=" + winWidth 
           + ",height=" + winHeight + winFeatures)
    popWin.focus();
  }
  
// close pop-up window if it is open
function closePopWin(){     
  if (navigator.appName != "Microsoft Internet Explorer" 
      || parseInt(navigator.appVersion) >=4) //do not close if early IE
  if(popWin != null) if(!popWin.closed) popWin.close() 
  }
  
// Function used by openWin() function for placement of pop-up window
// Makes the window popup in the upper left corner 
function getLocation(winWidth, winHeight, winLeft, winTop){
  var winLocation = ""
  if (winLeft < 0)
    winLeft = screen.width - winWidth + winLeft
  if (winTop < 0)
    winTop = screen.height - winHeight + winTop
  if (winTop == "cen")
    winTop = (screen.height - winHeight)/2 - 20
  if (winLeft == "cen")
    winLeft = (screen.width - winWidth)/2
  if (winLeft>0 & winTop>0)
    winLocation =  ",screenX=" + winLeft + ",left=" + winLeft	
                + ",screenY=" + winTop + ",top=" + winTop
  else
    winLocation = ""
  return winLocation
  }