var viewimage=null

function MM_openBrWindow(image,caption,width,height) {

  height += 50
  var url = "view_image.php?Image=" + image + "&Caption=" + caption 
  var features = "resizable=yes,height=" + height + ",width=" + width

  viewimage = window.open(url,'viewimage',features)
  viewimage.resizeTo(width,height) 
  viewimage.focus()  
}