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
  	}