function popUp(strURL,strType,strWidth,strHeight) {
  var strOptions="";
  var browser=navigator.appName;
  if (browser=="Opera") {
    var xpos=(window.innerWidth - strWidth) / 2;
    var ypos=(window.innerHeight - strHeight) / 2;
  }
  else {
    var xpos=(screen.width - strWidth) / 2;
    var ypos=(screen.height - strHeight) / 2;
  }
  if (strType=="console") strOptions="resizable,status,height="+strHeight+",width="+strWidth+",left="+xpos+",top="+ypos;
  if (strType=="fixed") strOptions="status,height="+strHeight+",width="+strWidth+",left="+xpos+",top="+ypos;
  if (strType=="elastic") strOptions="toolbar,menubar,scrollbars,resizable,location,status,height="+strHeight+",width="+strWidth+",left="+xpos+",top="+ypos;
  window.open(strURL, "newwin", strOptions);
}