function pop(url, name, features, myWidth, myHeight, isCenter) {
  if(window.screen)if(isCenter)if(isCenter=="1"){
	var myLeft = (screen.width-myWidth)/2;
	var myTop = (screen.height-myHeight)/2;
	features+=(features!='')?',':'';
	features+='scrollbars=no,left='+myLeft+',top='+myTop;
  }

flop=window.open(url,name,features+((features!='')?',':'')+'width='+myWidth+',height='+myHeight);
flop.focus();
}