var newwindow;

	function popup(theURL,winName,features, myWidth, myHeight, isCenter)
{ 
  if(window.screen)if(isCenter)if(isCenter=="true"){ 
    var myLeft = (screen.width-myWidth)/2; 
    var myTop = (screen.height-myHeight)/2; 
    features+=(features!='')?',':''; 
    features+=',left='+myLeft+',top='+myTop; 
  } 
  newwindow = window.open(theURL,winName,features+((features!='')?',':'')+'width='+myWidth+',height='+myHeight); 
  if (window.focus) {newwindow.focus()}
}